Net work done by the 110N force = F.dx = Fd[Assuming the force acts in a straight line]
=> W = 110*15 =
1650N[Work done in pusing the object]
Work done by the friction, Wf = 70* 15 = 1050 J
Here force applied by us in pushing will do two things, to overcome frictional force and to provide kinetic energy to the body. Hence
Net Kinetic Energy = W - Wf = 1650 - 1050 = 600 J
Find the energy turned into heat ??