Which wave will be the loudest? A. A frequency of 55 Hz and an amplitude of 5 meters.
B. A frequency of 125 Hz and an amplitude of 15 cm.
C. A frequency of 12 Hz and an amplitude of 25 meters
D. A frequency of 567 Hz and an amplitude of 20 meters.

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W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j