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A boy throws a 0.19 kg stone into a river from a 15.0 m high bridge. If the initial speed of the stones is 12.0

A boy throws a 0.19 kg stone into a river from a 15.0 m high bridge. If the initial speed of the stones is 12.0 m $/$ s vertical downward, what is the stone kinetic energy and momentum of the stone as it hits the water? Ignore air resistance.

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