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A motorcycle of mass m speeds up from speed v0 to speed vf in a time...

A motorcycle of mass m speeds up from speed v0 to speed vf in a time t.
a) Derive an equation for the average force F on the motorcycle. (You'll want to first come up with an equation for the acceleration of the motorcycle in terms of v0, vf, and t.).
b) Calculate the force that will accelerate a 210-kg motorcycle from 12.5 m/s to 20.8 m/s in 6.9 seconds.
c) how does this force compare with the weight of the motorcycle? Compute the ratio F/mg.

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