A-LevelPhysicsWork, energy and power9702/12 · May/June 2016 · Q171 Mark
A boy on a bicycle starts from rest and rolls down a hill inclined at 30° to the horizontal. The boy and bicycle have a combined mass of 25 kg. There is a frictional force of 30 N, which is independent of the velocity of the bicycle. What is the kinetic energy of the boy and the bicycle after rolling 20m down the slope?
A1850 J
B2450 J
C3050 J
D3640 J
✓ Correct answer
A: 1850 J
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