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Work done = Force x distance the applied force has moved, hence 500 = 25d where d = unknown distance. Therefore the distance moved is 500/25 = 20m

velocity (v) = frequency of the wave (f) x wavelength of wave (in metres) (λ)
50cm in metres: 50/100 = 0.5m
Therefore (v) = 680 x 0.5= 340 (m/s)

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