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A particle of mass 1 kg is subjected to ...

A particle of mass 1 kg is subjected to a force which varies with distance as shown. If it starts its journey from rest at `x=0.` then its velocity at `x=15` m is

A

0 m/s

B

`20sqrt2m//s`

C

`20sqrt3m//s`

D

`40m//s`

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The correct Answer is:
D
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