Question

Ball is called in a straight line with a speed of 5 ms–1 towards a bigger ballB lying 20 m away. After collision with ball B, full A retraces the path and reaches its starting point with a speed of 4 ms–1. What is the average velocity of ball A during the time interval 0 to 6 s?

Solution

Correct option is

2 ms–1

 

The time taken by ball A to reach ball . During the time interval 0 to 6 s, ball A covers a distance of 20 m upto ball B (which takes 4 s) and in the next 2 s, it covers a distance of

 in the opposite direction. 

 Net displacement = 20 m – 08 m 

                                 = 12 m 

                                 = 2 ms–1.

SIMILAR QUESTIONS

Q1

A stone is dropped from a height of 125 m. If g = 10 ms–2, what is the ratio of the distances traveled by it during the first and the last second of its motion? 

Q2

 

A body, moving in a straight line, with an initial velocity u and a constant acceleration a, covers a distance of 40 m in the 4th second and a distance of 60 m in the 6th second. The values of u and a respectively are    

 

Q3

A simple pendulum is hanging from the ceiling of a compartment of a train. It is observed that the string is inclined towards the rear of the train. If follows that the train is

Q4

 

The displacement of a body from a reference point, is given by

          

where x is in metres and t in seconds. This shown that the body is

Q5

A car moving at a speed v is stopped in a certain distance when the brakes produce a deceleration a. If the speed of the car was nv, what must be the deceleration of the car to stop it in the same distance and in the same time?

Q6

 

A car is moving at a certain speed. The minimum distance over which it can be stopped is x. If the speed of the car is doubled, what will be the minimum distance over which the car can be stopped during the same time? 

 

Q7

A ball is thrown vertically downward with a velocity u from the top of a tower. It strikes the ground with a velocity 3u. The time taken by the ball to reach the ground is given by

Q8

 

The distance x covered by a body moving in a straight line in time t is given by   

            

The acceleration of the body will vary as

Q9

A bullet is fired vertically upwards with an initial velocity of 50 ms–1. It covers a distance h1 during the first second and a distance h2 distance the last 3 seconds of its upward motion. If g = 10ms–2h1 and h2 will be related as