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A block of mass 2 kg is hanging over a s...

A block of mass `2 kg` is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force `F = 40 N`. The kinetic energy of the particle increase `40 J` in a given interval of time. Then : `(g = 10 m//s^(2))`.
.

A

tension in the string is 40 N

B

displacement of the block in the given interval of time is 2m

C

work done by gravity is `-20J`

D

work done by tension is 80 J

Text Solution

Verified by Experts

The correct Answer is:
A, B, D

Free body diagram of block is as shown in figure. From work energy theorem
`W_(net)=triangleKE` or `(40-20)s=40`
`s=2m`
Work done by gravity is `-20xx2=-40J`
and work done by tension is `40xx2=80J`
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