The power in transverse wave is given as follows (see https://opentextbc.ca/universityphysicsv1openstax/chapter/16-4-energy-and-power-of-a-wave/):
P=21μA2ω2v where μ=0.10kg/m, A=2.0cm=0.020m,
ω=2πf where f=120Hz and
v=μFT where FT=135N. Combining it all together, obtain:
P=21μA2(2πf)2μFT=2π2μA2f2μFTP=2π2⋅0.1⋅0.022⋅1202⋅0.1135≈4.2×102WAnswer. 4.2×102W
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