A ball of mass m approaches a wall of mass M m with speed 4 m s - 1 along the normal to the wall. The speed of the wall is 1 m s - 1 towards the ball. The speed of the ball after an elastic collision with the wall is -

Question

A ball of mass m approaches a wall of mass M > > m with speed 4 m s - 1 along the normal to the wall. The speed of the wall is 1 m s - 1 towards the ball. The speed of the ball after an elastic collision with the wall is -, 5 m s - 1 away from the wall, 9 m s - 1 away from the wall, 3 m s - 1 away from the wall, 6 m s - 1 away from the wall

MARKS App · Accepted Answer

Let v be the velocity of ball after collision, collision is elastic ∴ e = 1 or r e l a t i v e v e l o c i t y o f s e p a r a t i o n = r e l a t i v e v e l o c i t y o f a p p r o a c h ∴ v - 1 = 4 + 1 or v = 6 m / s (away from the wall)

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