9. A devioo that throws tennis balls oontaina a opting that oomoreaaeo. The spring can compress about 5.2 cm. If each tennis ball weighs 5? g and the spring stiffness is 550 Mm : KlNI- I} What tome due. the spring exert an the tennis ball? b} What is the amount of elastic potential energy of the spring? o] At Mist maximum speed Is the tennis ball thrown\"? d} It ths- domino projected the hall directly upwards, what would be the haighl maximum hit I31." \"1. bullet