Work Energy And Power Question 83

Question: A lead ball strikes a wall and falls down, a tennis ball having the same mass and velocity strikes the wall and bounces back. Check the correct statement

Options:

A) The momentum of the lead ball is greater than that of the tennis ball

B) The lead ball suffers a greater change in momentum compared with the tennis ball

C) The tennis ball suffers a greater change in momentum as compared with the lead ball

D) Both suffer an equal change in momentum

Show Answer

Answer:

Correct Answer: C

Solution:

Change in the momentum = Final momentum - initial momentum

For lead ball $ \Delta {{\vec{P}} _{lead}}=0-m\vec{v}=-m\vec{v} $

For tennis ball $ \Delta {{\vec{P}} _{tennis}}=-m\vec{v}-m\vec{v}=-2m\vec{v} $

i.e. tennis ball suffers a greater change in momentum.



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