AP Physics 1 Unit 3: Work, Energy, and Power

A $0.50\text{kg}$ ball is dropped from rest from a height of $20\text{m}$. Ignoring air resistance and taking $g=10{\text{m/s}}^2$, what is its speed just before hitting the ground?

Which of the following statements about work is correct?

A $500\text{kg}$ roller-coaster car at the top of a $40\text{m}$ hill is moving at $5.0\text{m/s}$. With $g=10{\text{m/s}}^2$ and ignoring friction, what is its speed at the bottom of the hill?

A $1000\text{kg}$ elevator rises at a constant $2.0\text{m/s}$. Taking $g=10{\text{m/s}}^2$, what is the minimum power the motor must deliver?

A horizontal force of $20\text{N}$ pushes a box $5.0\text{m}$ across a level floor. How much work does the force do on the box?

A spring with spring constant $k=200\text{N/m}$ is compressed $0.10\text{m}$ from its natural length. How much potential energy is stored in the spring?

A $2.0\text{kg}$ object's speed increases from $3.0\text{m/s}$ to $5.0\text{m/s}$. What is the net work done on the object?

A block of mass $m$ slides down a frictionless ramp from height $h$. At the bottom it enters a horizontal surface with kinetic friction coefficient $\mu$. How far along the horizontal surface does the block slide before stopping?