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Coversion of kinetic to potential energy

A girl of mass m1= 60 kilograms springs from a trampoline with an initial upward velocity of v1= 8.0 meters per second. At height h= 2.0 meters above the trampoline, the girl grabs a box of mass m2 = 15 kilograms. For this problem, use g= 9.8 meters per second per second for the magnitude of the acceleration due to gravity.
What is the maximum height (h max) that the girl (with box) reaches? Measure (h max) with respect to the top of the trampoline. Express your answer numerically in meters.

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As the girl moves upwards its initial kinetic energy is gradually converted into potential energy. Potential energy at height h is given by mgh where m = mass.

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