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A daring 51-kg swimmer dives off a 9-m high cliff. At the edge of the cliff...

A daring 51-kg swimmer dives off a 9-m high cliff. At the edge of the cliff her speed is 1.5 m/s. As the swimmer travels through the air, air resistance does -900 J of work on her. The next three questions have to do with this swimmer.

Which is the correct conservation of energy expression for this diving swimmer?

a.

½kx12 + mgy1 = ½mv22
b.

½mv12 + mgy1 + Wother = ½mv22
c.

½mv12 + ½kx12 = mgy2
d.

½mv12 + Wother = 0

Using the appropriate conservation of energy expression, determine the kinetic energy of the swimmer as she safely enters the water at the bottom of the cliff.

Using your result from above, determine the swimmer's speed as she enters the water.

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