A ball is moving with velocity `2m//s` towards a heavy wall moving towards the ball with speed `1m//s` as shown in figure. Assuming collision to be elastic, find the velocity of ball immediately after the collision.
Text Solution
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The speed of the wall will not change after the collision. Let `v` be the velocity of the ball after collision in the direction shown in figure. Since collision is elastic `(e=1)`. Speed of separation speed `=` Speed of approach `=v-1=2+1` or `v=4m/s`
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