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COMEDK2014PhysicsCenter of Mass, Momentum and Collision

A tennis ball of mass m strikes a wall with a velocity v and retraces the same path. Calculate the change in momentum.

Options

  1. A+4 m v
  2. B-4 m v
  3. C+2 m v
  4. D-2 m v

Correct answer

D. -2 m v

Step-by-step solution

The given situation is shown below Change in momentum, p=p_ f -p_ i =m(-v)-(m v)=-m v-m v=-2 m v

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