# physics

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The tops of the towers of the golden gate bridge in san Francisco, are 227m above the water. suppose a worker drops a 655g wrench from the top of a tower. if the average force of air resistance is 2.20 percent of the force of free fall what will the kinetic energy of the wrench be when it hits the water?

• physics -

I suppose that what they are calling the "force of free fall" is the weight, M g.

Frictional work performed against air resistance while falling will then be
0.022 M g H

Subtract that from M g H to get the kinetic energy when it hits the water.

(1/2) M V^2 = 0.978 M g H

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