15. We take the reference point for gravitational potential energy at the position of the marble when the spring is compressed. (a) The gravitational potential energy when the marble is at the top of its motion is gUmgh=, where h= 20 m is the height of the highest point. Thus, Ug=×=−50 109809832....kgm s20 mJchdibg(b) Since the kinetic energy is zero at the release point and at the highest point, then conservation of mechanical energy implies ΔUg+ ΔUs= 0, where ΔUsis the change in
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.