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A 0.40 kg rock is nudged off a bridge into a river below. If the rock...

A 0.40 kg rock is nudged off a bridge into a river below. If the rock begins with zero velocity and has a speed of 20 m/s just before it hits the water, how much kinetic energy did it have just before it hit the water? Use the approximate value of g, 10 m/s/s. Ignore air resistance.

A. How much potential energy did it have before the fall?

B. What is the height of the bridge.

C. Now suppose the rock wasn't just dropped, but was tossed straight upward with an initial speed of 5 m/s/ How much kinetic energ did it have just before it hit the water?

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