3 a) A spherical ball of mass 5 kg is being pushed up a rough plane inclined at 30 to the horizontal with a force of 100 N acting in the direction of the inclined plane. The spherical ball is displaced 20 m along the inclined plane. Given that the coefficient of kinematic friction between the block and the inclined plane, u = 0.2. With the aid of a free body diagram and assuming the value of g = 9.81ms-2, compute the following 1 ) total work done by the pushing force [2 marks] ii) change in gravitational potential energy [2 marks ] iii) Work done by the friction force [2 marks] iv) change in kinetic energy [2 marks]