a) For this task, you used an example of a motorbike accelerating up a hill of certain incline. The rider accelerates from v1 (m/s) to v2 (m/s) over a distance of D (m), whilst climbing a hill of slope 1 in 20. The values of v1, v2 and D are given below The mass of the motorbike is 200kg and the average resistance to motion, including drag, is 120N. i. Calculate the work done by the vehicle ii. The potential energy and kinetic energy at the bottom and at the top of the hill.