A toy cannon uses a spring to project a 5.28-g soft rubber ball. The spring is originally compressed by 4.99 cm and has a force constant of 8.08 n/m. When the cannon is fired, the ball moves 15.2 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.032 2 n on the ball.
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sorry I don't know how it be solved........
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