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A person starts at rest at sea level and is later running at the top of a hill. Write a work/energy equation. A cannon

A person starts at rest at sea level and is later running at the top of a hill. Write a work/energy equation. A cannon launches a 5 kg cannonball. When it is at a height of 16m, it is moving at 8 m/s. Find the work done during the launch.

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