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# M2 question watch

1. A ball of mass m kg moving at u m/s hits a smooth horizontal plane at an angle of x to the horizontal. The coefficient of restitution is 0.
Find the impulse on the plane.

Here is what I did:

Since e=0, there is no vertical velocity, so the speed after=horizontal speed before.

I = m(v - u)
so I = m(u cos x + u) = mu(cos x +1)
however the answer in the book gives something else.
Where have I gone wrong?
2. IDontKnowReally

Does the book give ?

If so you need to draw the diagram with the components of velocity parallel and perpendicular to the plane. The velocity parallel to the plane will not change.

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Updated: November 9, 2016
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