First slide
Coefficient of restitution

A ball moving with a velocity v strikes a wall moving towards the ball with a velocity u as shown in fig. An elastic impact occurs. Consider the mass of the wall to be infinitely great. The work done by the wall during collision is


 Initial K.E=12mv2; Final K.E ==12m(v+2u)2 12mv2+ΔW=12m(v+2u)2ΔW=m24u2+2mvu=2mu(u+v)

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