Tommy and his skateboard have a combined mass of 50 kg. Joe and and his skateboa

Question

Tommy and his skateboard have a combined mass of 50 kg. Joe and and his skateboard have acombined mass of 100 kg. You push both of them with the same force - Tommy for twoseconds and Joe for 1 second. After the pushes,

A. Tommy's change in speed is 4 times greater than Joe's

B. Joe's change in speed is 4 times greater than Tommy's

C. Joe's change in speed is 2 times greater than Tommy's

D. Tommy's change in speed is 2 times greater than Joe's

E. Not enough information to tell what happens

Please show work

Explanation / Answer

Answer will be A.

Tommy's change in speed is 4 times greater than Joe's.

Because, the situation totally depends on the inertia. For heavy particle change of inertia is more resistive than lighter one. So, Joe will resist more.

Again, time of application of external force is the reason of increment of speed. Time span of Applied force on Tommy is more than of Joe's. So in both speed will be increased two times each. So it will increase 4 times.

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