A Ball of Mass 0

Multiple Choice

A ball of mass 0.50 kg is pushed against a horizontal spring of negligible mass and force constant of 450 N/m until the spring is compressed a distance of 0.40 m. When the spring is released, the ball travels along a frictionless, horizontal surface to point B, at the bottom of a vertical circular track of radius R = 1.00 m, and continues to move up the track, where the ball experiences an average friction force of 7.00 N. The speed of the ball at the top of the track

A) is 0 m/s.
B) is 4.1 m/s.
C) is 7.0 m/s.
D) is 12 m/s.
E) cannot be determined because the ball does not reach the top of the track.