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A child is standing at one end of a long...

A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed :

A

zero

B

(v + u)

C

(v - u)

D

v

Text Solution

Verified by Experts

The correct Answer is:
D
The speed of the center of mass of the system remains unchanged (equal to v) because no external force acts on the system. The forces involved in running on the trolley are internal to this sytem.
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