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A man weighing 60 kg is standing on a tr...

A man weighing 60 kg is standing on a trolley weighting 240 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a velocity of 1 m/s, then after 5s, his displacement relative to the ground is

A

`6m`

B

`4.8m`

C

`3.2m`

D

`2.4m`

Text Solution

Verified by Experts

The correct Answer is:
C
The forward momentum of the man
backward momentum of (man + trolley)
`therefore 60xx1= (60+240)v" " therefore 60= 300v`
`therefore v=(1)/(5) = 0.2 m//s`
`therefore ` The speed of the man w.r.t. the ground
`v=1-0.2 = 0.8m//s`
`therefore` The displacement of the man
`=v xx t= 0.8 xx 4= 3.2m`
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