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Physics 14 Online
OpenStudy (anonymous):

A child's toy horizontally launches a 20-g ball using a spring that was originally compressed 8.0 cm. The spring constant is 30N/m. What is the work done by the spring moving the ball from its compressed point to its relaxed position, where the ball is released? What is the kinetic energy of the ball at launch? what is the speed of the ball?

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