A bicyclist is stopped at the entrance to a valley, as sketched below: Where wou

Question

A bicyclist is stopped at the entrance to a valley, as sketched below: Where would the bicyclist have the highest potential energy? Where would the bicyclist have the lowest potential energy? Where would the bicyclist have the highest kinetic energy? Where would the bicyclist have the highest speed? Would the bicyclist's kinetic energy be higher at A or D? Would the bicyclist's potential energy be higher at A or D? Would the bicyclist's total energy be higher at A or D? (choose one) (choose one) (choose one) (choose one) (choose one) C (choose one) (choose one) Suppose the bicyclist lets off the brakes and coasts down into the valley without pedaling. Even if there is no friction or air resistance to slow him down, what is the farthest point the bicyclist could reach without pedaling? (choose one)

Explanation / Answer

1) At point F,the highest elevated point on the ground the bicyclist will have the highest potential energy.

Potential energy=mass*gravity*height ,greater the height higher is the potential energy

2) At point D,the lowest point on the ground the bicyclist will have the lowest potential energy.

Potential energy=mass*gravity*height ,smaller the height lower is the potential energy

3)At point B

All the potential energy at A gets converted to kinetic energy at this point,for the bicyclist .

4)At point B

All the potential energy at A gets converted to kinetic energy at this point,for the bicyclist .So he will have the highest speed

Kinetic energy=mass*(Velocity)^2

So,Velocity=(KE/mass)^0.5

3)

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