physics wave

A) Show that the average rate with which energy is transported along a cord by a mechnical wave of frequency f and amplitude D is:
P(average) = 2(pi^2)u v(f^2)(D^2)
v is speed of the wave
u is the mass per unit length (M/L)

B) If the cord is under a tension Ft =100 N and has mass per unit length 0.10 kg/m, what power is required to transmit 120 Hz waves of amplitude 2.0 cm?

For part b, I think I got the answer, I just plug in the numbers with (root (100N/.10kg/m)) = v, right?
I'm not sure how to prove part A though.

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