A body of mass 0.3 kg is taken up an inclined plane length 10 m and height 5 m, and then allowed to slide down the bottom again. The coefficient of friction between the body and the plane is 0.15. What is the
(i) work done by gravitational force over the round trip?
(ii) work done by the applied force over the upward journey?
(iii) work done by the frictional force over the round trip?
(iv) kinetic energy of the body at the end of trip?