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Power can be defined as work done (force * distance) / time taken.

Since distance / time is velocity, power could be defined as force overcome * velocity,

Pedalling a 70 kg rider up a 10 degree incline, the maximum speed obtained is 8 metres per second.

The force due to gravity acting against the rider is: sin 10 degrees * 70 * 9.81 = 119 newtons (approx)

So force overcome * velocity = 119 * 8 = 952 watts (maximum power rating)

Note:

Rolling resistance has been ignored.

Air resistance has also been ignored.

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