Motion Class Ix

May 11, 2018 | Author: Gaurav Sharma | Category: Speed, Acceleration, Velocity, Kinematics, Classical Mechanics
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1. A car starts starts from from statio station n A at t = 0 reaches reaches stati station on B at t = 45 s and at stati station on C at 79 s when when continuo continuousl usly y traveling. What is the time taken by the car to move from B to C?

2. The SI unit of velocity is: 3. A train covers the distance between station A and B moving with a uniform speed of 30 km/hr in 75

minutes. Find the distance between A and B. 4.

A car starts at 10:00 am and this time was taken to be t 1 = 0 hrs. If the car reached another station at time t 2 = 4 hours, then what is the time shown by watch?

5. Ram moves moves from A to B in a straight straight line line and then he return returns s to C. If he takes 40 s to do this, this, what is his his average average velocity?

6. 7.

A body starts at 10 : 20 : 30 am and the time was taken to be t 1 = 0 s. If the body covers a distance of 10 km by the time t2 = 360 s, the absolute time at the moment is:

8. An electric electric train train is moving moving at a speed of 120 km/hr. km/hr. What distanc distance e will it cover cover in two hours? hours?

9. A car moves from station A to station B with a uniform speed of 10 m/s. It took 10 minutes to reach

station B. What is the distance between A and B? 10. A car travels a distance of 8 km from P to Q and then moves a distance of 6 km at right angle to PQ. What is the the magnitude of its displacement?

11. 12. Kumar Kumar is moving moving from Delhi to Chandigarh, Chandigarh, a distance distance of 250 km. He expects to reach Chandigarh Chandigarh in six hours. hours. What would be his average speed so that he can reach Chandigarh in time? 13. A train covers a distance distance of 90 km in in 40 minutes. What is is its speed?

14. Distance covered is a __________ quantity and displacement is a __________ quantity. 15. If the first 20 km is is covered by a speed of 40 km/hr and the the next 20 km is covered with a speed speed of 20 km/hr, what is the average speed during the journey? 16. An object travels 14 m in 6 sec and then then another 14 m in 4 sec. sec. What is the average average speed of the object? 17. The initial velocity velocity of a car which is stopped in 5 s by applying brakes is 45 km/hr. The acceleration acceleration of the car is: 18.

A car moving with a speed of 10 m/s towards North turns around and starts moving with a speed of 20 m/s towards South. What is the change in velocity?

19. A car starting starting from rest attains attains a velocity velocity of 36 km/hr in 5 sec. What will will be the accelerati acceleration on during the course of  motion? 20. The initial velocity of a bus which is stopped in 10 s by applying brakes (if the retardation produced is 1.5 ms –2) is:

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9212362121 21. Given the following data: a = 2 m/s , u = 2 m/s, v = 103 cm/hr, t = 10 s. Which of the terms given above does not have units consistent with SI system? 2

22. A body is moving North with a velocity of 22 m/s, turns West and continues with the same velocity. What is the change in its velocity? 23.

Given: u = 2 m/s, v = 3 cm/s, t = 10 s, a = 100 cm/s 2 Which of the following terms given above does not have units consistent with SI system?

24. A car is moving at a speed of 16 m/s and brakes are applied to bring it to a speed of 2 m/s. What is the change in velocity? 25. A car moving with velocity of 10 ms –1 is stopped by applying brakes. If the retardation produced is 0.5 ms –2, the

time in which it is brought to rest is: 26. The SI unit of acceleration is: 27. Consider the following data: u = 500 cm/s, v = 36 km/hr, t = 5s What will be the value of the acceleration so that it is consistent with the SI system? 28.

A car moving west turns left and then right, maintaining the same velocity. What is the magnitude of change in its velocity?

29. A car moving with velocity of 36 km/hr undergoes an acceleration of 1 ms –2 for 5 seconds. The final velocity

attained by the car is: 30.

An object moves in a circular path with a uniform speed of 36 km/hr. If it completes two revolutions per minute, the radius of the circular path is:

31. A car is moving along a straight road at a speed of 54 km/hr. By applying brakes, it is brought to rest within a distance of 50 m. Retardation of the car is: 32. A car is moving with a speed of 20 m/s. When brakes are applied, it stops in 10 seconds. Retardation produced by the brakes is:

33. Anchal is riding her bicycle with some initial speed and accelerates at a constant rate of

ms –2 for 4 s. She

covers a distance of 74 m during this du ration. What was the initial speed of bicycle 34. A car, starting from rest attains a velocity of 18 ms –1 in 9 s by accelerating uniformly. The distance covered by it

before it attains the velocity is: 35. An object moves in a circular path of radius 1 m. If it completes 3 revolutions per second, its average speed is: 36. A cable car moving with a speed of 8 m/s suffers a uniform retardation of 1 ms –2. After how much time will its

speed be reduced to 3 m/s? 37.

A car moving with uniform acceleration, accelerates from rest to reach a speed of 15 m/s in 5 s. The distance travelled by the car during this time is:

38. Ritesh, driving a motorbike with some initial velocity, accelerates at a constant rate of

ms –2 for 10 seconds and

the bike attains a velocity of 18 km/hr. The distance covered by Ritesh in 10 seconds is: 39. A bus, initially moving with a velocity of 72 km/hr, is slowed down to 36 km/hr by applying brakes, producing a

uniform retardation of 2 ms –2. The distance covered by bus before coming to rest is: 40. A bus, traveling with constant acceleration, increases its speed from 5 ms –1 to 15 ms –1while covering a distance of 

80 m. The time it takes to cover the distance is: 41. A fast moving bus stops by applying brakes, producing a constant retardation for 10 s. It covers a distance of 100 m before coming to rest. Retardation produced in the bus is:

From RACHNA CHAWLA

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9212362121 42. A car starting from a position of rest undergoes a constant acceleration of 1 ms –2. How much time will it take to cover 50 m? 43. A fast moving train is brought to rest within a distance of 100 m by applying brakes, which produce a uniform

retardation of 8 ms –2. The initial velocity of the train was: 44. A racing car travels in a circular path with a uniform speed for a period of 132 s. Its average speed is 7 ms –1. If the

radius of the circular path is 49 m, the number of revolution made by it in the given period is: 45. A moving train is brought to rest in 10 s by applying brakes, which produce a uniform retardation of 5 ms –2. The

distance covered by the train before coming to rest is: 46.

A car accelerating at a rate of 2 ms –2 attains a speed of 24 m/s. What was its speed 10 s before?

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