Which of the following is the best example of kinetic energy being transformed into potential energy? bending a paper clip
⊝

starting an automobile engine
⊝

coasting down hill on a bicycle
⊝

winding the spring on a toy car

coasting down hill on a bicycle

Explanation:

Coasting down the hill on a bicycle is a typical example of how kinetic energy is being transformed to potential energy in a system.

Kinetic energy is the energy due to the motion of a body, it can be derived using the expression below;

      K.E  = m v²

Potential energy is the energy due to the position of a body. It can be derived using;

     P.E  = mgh

m is the mass

v is the velocity

g is the acceleration due to gravity

h is the height

Now, at the top of the hill, the potential energy is at the maximum. As the bicycle coasts down the potential energy is converted to kinetic energy.  

radiation warms things up temp rises convection currents air circ windy weather

we need to know the time interval during which the force acts. impulse of force = momentum change