A 567-kg trailer is hitched to a truck. Find the work done by the truck on the trailer in each of the following cases. Assume rolling friction is negligible. (a) The trailer is pulled at constant speed along a level road for 1.54 km. kJ (b) The trailer is accelerated from rest to a speed of 88.5 km/h. kJ (c) The trailer is pulled at constant speed along a road inclined at 12.8°for 1.54 km. kJ

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