Stephen R. answered • 04/22/16

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The total energy of the bicycle is equal to the gravitational energy and kinetic energy.

First velocity:

energy = E(grav) + kE

energy = mgh + 1/2 mv^2

energy = mgh + 1/2 m(2)^2

energy = mgh + 2m

second velocity:

energy = mgh + 1/2 mv^2

energy = mgh + 1/2 m(4)^2

energy = mgh + 8m

energy = mgh + 1/2 m(4)^2

energy = mgh + 8m

as can be seen the KE has increased by 4 times so:

a is not correct

b is not correct

c is correct (this would change only if there was a difference in height)

d is not correct