The following graph shows how force varies with compression for a spring. 15- 10- To Compression (cm) The spring is compressed by 20 cm and it is used to horizontally propel a ball of mass 100 g. The ball starts from rest. 14 Calculate the amount of elastic potential energy stored in the spring when it is compressed by 20 cm. 15 What is the kinetic energy of the ball when the spring has returned to its original length? (Assume that no energy is transferred to the environment.) 16 What is the speed of the ball when the spring has returned to its original length? (NBuds os pagde o

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