A toy cannon uses a spring to project a 5.31 g soft rubber ball. the spring is originally compressed by 5.09 cm and has a force constant of 7.99 n/m. when the cannon is fired, the ball moves 15.2 cm through the horizontal barrel of the cannon, and there is a constant frictional force of 0.0325 n between the barrel and the ball. (a) with what speed does the projectile leave the barrel of the cannon
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