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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 order 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 strings is `40 N`

B

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

C

work done by gravity is ` - 20 J`

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 an shown in figure.

From work-energy theorem `W_("net") = Delta KE`
or `(40 -20) s = 40`
`:. s = 2 m`
Work done by gravity is `- 20 xx 2 = - 40 J`
and work done by tension is `40 xx 2 = 80 J`.
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