Question

A ball is moving towards a wall with the speed of 5 meters per second. It...

A ball is moving towards a wall with the speed of 5 meters per second. It bounces back with the same speed. Which of the following is true? A. The momentum of the ball changed, the energy didn’t change B. The momentum of the ball didn’t change, the energy changed C. Both the momentum and the energy of the ball changed D. Neither the momentum nor the energy of the ball changed

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Answer #1

Momentum equation is   Direction of velocity will be reversed after collision. So momentum is changed

Kinetic energy equation is . Here even if the direction of velocity will be reversed after collision, the equation have the 'v' to be squared. So the Kinetic energy doesnot change

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