Question

A body of mass 5 kg is moved up over 10m along the line of greatest slope of a smooth inclined plane of inclination 30 degrees with horizontal. If g=10ms-2 ,the work done will be

Answer 1

Work=total energy=potential energy.

Potential energy=mgh.

M=5kg,g=10m/s-2,h=l/2(since a=30°).h=10/2=5m

So work=250J.