A wall moving with velocity 2 cms^(-1) t...

A wall moving with velocity `2 cms^(-1)` towards the ball and ball is moving towards the wall with a velocity `10 cms^(-1)`. It hits the wall normally and makes elastic collision with wall. The velocity of ball after collision with wall in `cms^(-1)`.

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The correct Answer is:

`e = (v_(2)-v_(1))/(u_(1)-u_(2)) = 1`.

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