## Question

Ball is called in a straight line with a speed of 5 ms^{–1} towards a bigger ball*B* 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

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}.

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