A body of mass 5 kg rests on a rough horizontal surface of coefficent of friction 0.2. The body is pulled through a distance of 10m by a horizontal force of 25 N. The kinetic energy acquired by it is `(g=10 ms^2)`

Options

A. 330 J
B. 150 J
C. 100 J
D. 50 J

Answer

B

Explanation

K.E=Total work done on the body-work done against friction.
`=Fs-mu mg s=25 xx 10 - 0.2 xx 5 xx 10 xx 10=150 J.`