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

A block of mass `2kg` 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=40N` . At `t=0` the system is at rest as shown. Then in the time interval from `t=0` to `t=(2)/(sqrt(10))` seconds, pick up the correct statement `(s): (g=10m//s^(2))`

A

tension in the string is `40N`

B

work done by gravity is `-20J`

C

work done by tension on block is `80J`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A, C
Acceleration of block is `=10m//s^(2)`
`:. ` displacement `s=(1)/(2)at^(2)=(1)/(2)xx10xx(4)/(10)=2m`
Tension in the string is `40N `
Work done by gravity is
`-20xx2=-40J` and work done by tension is `40xx2=80J`
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