A fairground vehicle of total mass 20 000 kg started from re

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A fairground vehicle of total mass 20 000 kg started from rest on a downhill track and 80 seconds later,after travelling a distance of 120 m,it reached a speed of 25 m s–1 at the bottom of the track,30 m lower than its starting point.
Its gain of kinetic energy in this time = _______________
Its loss of potential energy in this time = _______________
The energy transferred to the surroundings due to friction and drag = _______________
The mean force opposing the motion of the vehicle = __________

a) Its gain of kinetic energy in this time = 6.25 × 106 J
b) Its loss of potential energy in this time = 5.88 × 106 J
c) The energy transferred to the surroundings due to friction and drag = 3.7 × 105 J
d) The mean force opposing the motion of the vehicle = 3.1 kN

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