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# M2 Mock 2000 Edexcel Q... watch

1. This question is given on the M2 Mock 2000 Paper. Solution of whole paper would be nice but if not, could you answer this q?

1) A Smooth sphere is moving with speed 'U' in a straight line on a smooth horizontal plane. It strikes a fixed smooth vertical wall at right angles. The coefficient of restitution between the sphere and the wall in 0.5.

Find the fraction of the Kinetic Energy of the sphere that is lost as a result of the impact.

(5 Marks)

2. it will rebound off the wall with velocity: -eu = -u/2

initial K.E. = (1/2)mU^2

final K.E. = (1/2)m(-U/2)^2 = (1/8)mU^2

K.E. lost = (mU^2/2) - (mU^2/8) = (mU^2)/4

fraction of K.E. lost = (mU^2/4) / (mU^2/2) = (1/4) / (1/2) = 1/2

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Updated: April 16, 2004
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