Which of the following is an example of potential energy?

Which of the following best describes the relationship between $\mathrm{kinetic energy}$ and $\mathrm{potential energy}$ in a closed system with no energy loss?

When a skydiver first jumps from a plane, which energy transformation primarily occurs?

A battery is connected to a $21.0\Omega$ resistor. If the circuit operates for one minute, how much work $W$ does the battery perform during this time? (Assume the current through the resistor is $I$ and the battery voltage is $V$.)

A car of mass $m$ starts from rest at the top of a frictionless hill of height $h$. What is the car's speed after coasting down the other side to the bottom of the hill?

A cantilever behaves like an ideal spring with a spring constant of $k$. What is the mechanical work done by the cantilever when its extension increases from $10nm$ to $15nm$?

When a proton slows down from an initial speed of $0.8c$ to a final speed of $0.6c$, what happens to its kinetic energy?

An object of mass $m$ is projected vertically upward with initial speed $u_0$. What is the speed $u$ of the object when it reaches a height equal to $\frac{1}{2}{h}_{\max }$ above the launch point? (Neglect air resistance.)