A Bead Is Moving with a Speed of 20 M/s

A bead is moving with a speed of 20 m/s at position A on the track shown in the figure.This track is friction-free,and there is no appreciable air resistance.What is the speed of the bead at point C?

A) 0 m/s
B) 34 m/s
C) 69 m/s
D) 20 m/s
E) We cannot solve this problem without knowing the mass of the bead.

Correct Answer:

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