A ball of mass m approaches a wall of ma...

A ball of mass m approaches a wall of mass M (M>>m), with speed 2 `ms^(-1)` along the normal to the wall. The speed of wall is 1 `ms^(-1)` towards the ball. The speed of the ball after an elastic collision with the wall is-

`2ms^(-1)` away from the wall

`3ms^(-1)` away from the wall

`4ms^(-1)` away from the wall

`5ms^(-1)` away from the wall

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