3. The total mass of a truck is 14 Mg and each of the two sets of wheels (including their axles) has a mass of 240 kg and a radius of inertia of 380 mm. The effective diameter of each wheel is 1 m and the vehicle is accelerated uniformly from 36 km/h to 72 km/h in 30 seconds. Determine: (a) the total kinetic energy of the truck when it reaches the above velocity; (b) total amount of work done during acceleration; (c) the average power required during the above motion of the truck.