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A rock is thrown at a pendulum which is at rest and the rock sticks to...

A rock is thrown at a pendulum which is at rest and the rock sticks to the pendulum. The rock has a mass of 50g and the pendulum has a mass of 2 kg. The velocity of the rock is 20 m/s. If 0.02 J of energy is lost to friction during the swing, what is the maximum height reached by the masses?

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