APFIVE Conservation of Mechanical Energy
A roller coaster car of mass 500 kg moves along a track. At point A, it has a speed of 5 m/s at a height of 20 m. At point B, it has a speed of 15 m/s. Assuming no friction, what is the height of the car at point B?
A
10 m
B
0 m
C
15 m
D
5 m
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