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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 increases 40 J in a given interval of time. Then, `(g = 10 m//s^(2))`

A

tension in the string is 40 N

B

work done by gravity is - 20 J

C

work done by tension on block is 80 J

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A, C

Acceleration of block is `= 10 m//s^(2)`
`:.` displacement `s = (1)/(2) at^(2) = (1)/(2) xx 10 xx (4)/(10)`
`= 2 m`
Tension in the string is 40 N
Work done by gravity is
`- 20 xx 2 = - 40 J`
Work done by tension is
`40 xx 2 = 80 J`
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