ch08-p015 - 15. We take the reference point for...

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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 g Um g h = , where h = 20 m is the height of the highest point. Thus, U g = 50 10 98 098 3 2 .. . . kg m s 20 m J ch di b g (b) Since the kinetic energy is zero at the release point and at the highest point, then conservation of mechanical energy implies Δ U g + Δ U s = 0, where Δ U s is the change in
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