A marble (small glass sphere) rolls down a track. The bottom part of the track i

Question

A marble (small glass sphere) rolls down a track. The bottom part of the track is bent into a loop. The end, point A, of the track, from which the marble is released, is at a height of 0.80 m above the ground. Point B is the lowest point and point C the highest point of the loop. The diameter of the loop is 0.35 m.

The mass of the marble is 0.040 kg. Friction forces and any gain in kinetic energy due to the rotating of the marble can be ignored. The acceleration due to gravity is 10 m/s2.
What is the speed of the marble at C?

Explanation / Answer

speed at C = 3m/s

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