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A child is sitting at one end of a long trolley moving with a uniform speed `v` on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed `u` (w.r.t. trolley), the speed of the centre of mass of the system will.

A

`u + v`

B

v - u`

C

v

D

none

Text Solution

Verified by Experts

The correct Answer is:
C
( c) Velocity of centre of mass will remain unaffected as no external forcer acts on system.
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