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A body of mass 2 kg is being dragged wit...

A body of mass 2 kg is being dragged with uniform velocity of 2 m / s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is
. `(4.2"joule"//cal and g=9.8 m//s^(2))`

A

330 J

B

150 J

C

100 J

D

50 J

Text Solution

Verified by Experts

The correct Answer is:
B

Kinetic energy acquired by body
= (Total work done on the body) – (Work against friction)
`= F xx S -mu "mgS"= 25 xx10 - 0.2xx 5 xx10 xx10`
`=250 - 100 = 150` Joule
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