A motorcyclist (with a total mass of 180kg) travels up a hill. When she starts at the bottom of the hill (altitude 32m) her velocity is 43km/h. At the top of the hill (altitude 365m) she has a speed of 115km/h. The hill is 12km long and during the journey she applies a braking force of 694N over a distance of 8m. Calculate the useful work done by the motorcycle engine assuming that resistance to motion is constant and equal to 186N throughout the journey, calculate the useful power supplied by the engine if the whole journey took 9min and calculate the fuel energy required if the engine has an efficiency of 59%. Please guys help me out on this problem