Questions
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
detailed solution
Correct option is A
Initial K.E=12mv2; Final K.E ==12m(v+2u)2 12mv2+ΔW=12m(v+2u)2ΔW=m2⋅4u2+2mvu=2mu(u+v)Talk to our academic expert!
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A steel ball is released from a height of 27 m onto a fixed horizontal steel plate. On bouncing the ball rises to a height of 3 m. Then co-efficient of restitution is
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