Question

A child's play rifle uses a spring to fire a 5.21-g soft plastic ball. The spring...

A child's play rifle uses a spring to fire a 5.21-g soft plastic ball. The spring is compressed by 4.99 cm and has a spring constant of 7.94 N/m. When the rifle is fired, the ball moves 14.1 cm through the horizontal barrel of the rifle, and the barrel exerts a constant friction force of 0.032 7 N on the ball.

(a) With what speed does the ball leave the barrel of the rifle?
m/s

(b) At what point does the ball have maximum speed?
cm (from its original position)

(c) What is this maximum speed?

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