Question

a 68 kg skydiver with a parachute falls at constant velocity for 100 m how much work does the earth do on the skydiver

Answer 1

666.4×100=666400

This is the ans.

Answer 2

The earth does no work on her if she's falling in the direction of frictional force. But suppose it does work on the woman i.e in the opposite direction, N. Then we have F = mg where g is acceleration due to grav. So F = 68 * 9.8 = 666.4 Newton. Then work done = force * distance = 666.4 * 100 = 666400