A 60 kg weight is dragged on a horizontal surface by a rope upto 2 metres. If coefficient of friction is `mu=0.5` the angle of rope with the surface is `60^(@)`and `g=9.8m//sec^(2),` then work done is

Options

A. 294 J
B. 15 J
C. 588 J
D. 197 J

Answer

A

Explanation

Work=force`xx`displacement
`=F_(s)*d`
`=F_(s)d costheta`
`=muRd costheta` `(F_(s)=muR)`
`W=mumgdcostheta" "(R=mg)`
`=0.5xx60xx9.8xx2cos60^(@)`
`=294J`