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AP EAMCET202421 May 2024Morning ShiftPhysicsCenter of Mass, Momentum and CollisionActual

A ball falls freely from rest from a height of 6.25 m on to a hard horizontal surface. If the ball reaches a height of 81 cm after second bounce from the surface, the coefficient of restitution is

Options

  1. A0.3
  2. B0.45
  3. C0.75
  4. D0.6

Correct answer

D. 0.6

Step-by-step solution

From the figure, aligned & u= 2 10 6.25 & 5 5 ~m / s & v^ = 2 10 0.81 = 9 5 5 ~m / s aligned Coefficient of restitution, aligned & e ^2= v ^ u = 9 5 5 5 5 = 9 25 & e =0.6 aligned

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