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A constant force of 20N is applied to pu...

A constant force of 20N is applied to pull a body of mass 10 k, kept on a smooth horizontal surface. What is the increase in its kinetic energy if the body starts from rest and covers a distance of 5m?

A

100J

B

150J

C

80J

D

60J

Text Solution

Verified by Experts

The correct Answer is:
A
At the maximum height h, the P.E. of the stone =mgh and `therefore" K.E. at" h=0`
Its P.E. =Total energy =mgh
When the stone is at a height of `3/5h` its P.E. `=mg((3h)/(5)) =3/5 (mgh)`
K.E. at that height =Total energy-P.E.
`mgh-3/5mgh=2/5mgh`
At the height `(3h)/(5) (K.E.)/(P.E.) =((2)/(5)mgh)/((3)/5mgh)=2/3`
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