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A man weighing 80 kg is standing in a tr...

A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m/s, then after 4 sec his displacement relative to the ground will be

A

5m/s

B

4.8m

C

3.2m

D

3.0m

Text Solution

Verified by Experts

The correct Answer is:
C
Displacement of the man w.r.t. trolley in 4sec `x_(CM) + x_(T)= 4 xx 1= 4 rArr x_(T)= 4- x_(CM)`
Position of centre of mass remain constant `(4- x_(CM))320 = x_(CM) xx 80 rArr x_(CM)= (16)/(5)= 3.2m`
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