2. (a)Differentiate between kinetic energy and gravitational potential energy using your own words. (2) {b)Derive the unit for work in terms of the base quantities. (3) (c)In the figure below, the track connecting points A, B and C is frictionless. A student releases an object of mass 2 kg from point A from rest. The object then slides down the track. B E ' C &m : 45m 2 m v ' r (i) Calculate the speed of the object at point B. (ii) Calculate the total mechanical energy of the object at point C. (iii) Determine the work done by gravity when the object moves from point A to point C. (10) (d)In the figure below, a block is displaced to the right through Ax while under the influence of a force of magnitude F. Arrange the amount of work done by the force from the most negative to the most positive. Explain your reasoning