Answer:
Work = F * S force * distance
Power = Work / Time = F * S / t
Velocity = distance / time = S / t = v
Power = F * v
P = 685 N * (11 m / 8.75 s)
P = 685 N * 1.26 m/s = 861 Joules / sec = 861 Watts
(Note 1 Watt = 1 Joule / sec
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