How much thermal energy was produced in this process

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Kekoa takes his bodyboards to Mauna Kea to use as a sled. From rest, he jumps onto the bodyboard and slides down a 5-m high hill (vertical height is 5-m). His speed at the bottom is 9 m/s. Kekoa's mass is 60 kg and the sled is 1 kg. How much thermal energy was produced in this process?

Reference no: EM13650655

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