AP Physics 1 Medium practice

An astronaut of mass $80\text{kg}$ floating at rest in space throws a $2.0\text{kg}$ wrench at $10\text{m/s}$. What is the recoil speed of the astronaut?

A ball is thrown straight up with an initial speed of $15\text{m/s}$. Taking $g=10{\text{m/s}}^2$ and ignoring air resistance, what is the maximum height reached above the launch point?

An object hangs from a spring scale inside an elevator. When the elevator is at rest the scale reads $50\text{N}$. When the elevator accelerates upward at $2.0{\text{m/s}}^2$ (with $g=10{\text{m/s}}^2$), what does the scale read?

A stone is dropped from a tall cliff. Ignoring air resistance and taking $g=10{\text{m/s}}^2$, how far does it fall during the third second of its fall (between $t=2\text{s}$ and $t=3\text{s}$)?

Two identical disks (same mass $M$ and radius $R$) start from rest at the top of an incline. Disk A slides down without rotating; Disk B rolls without slipping. Which reaches the bottom with greater speed?

A figure skater spinning with arms extended pulls her arms in. As a result, her angular velocity increases by a factor of 3. By what factor does her rotational kinetic energy change?

A projectile is launched from ground level at a speed of $30\text{m/s}$ at an angle of $30°$ above the horizontal. Taking $g=10{\text{m/s}}^2$ and ignoring air resistance, how long is the projectile in the air before returning to the ground?

A uniform meterstick (mass $0.20\text{kg}$) is balanced at its center. A $0.10\text{kg}$ mass is hung $30\text{cm}$ from the pivot on one side. Where on the other side should a $0.30\text{kg}$ mass be hung to balance the stick?

Two students start from the same point. Student A runs at a constant $4.0\text{m/s}$. Student B starts from rest at the same instant and accelerates uniformly at $2.0{\text{m/s}}^2$. How long after the start does Student B catch up with Student A?

Two blocks of masses $3.0\text{kg}$ and $5.0\text{kg}$ are in contact on a frictionless surface. A horizontal force of $24\text{N}$ is applied to the $3.0\text{kg}$ block, pushing both. What is the contact force between the blocks?

A pendulum on Earth has period $T_E$. If you take it to a planet where gravity is one-fourth Earth's gravity, what is its new period?

Two masses, $m_1=2.0\text{kg}$ and $m_2=3.0\text{kg}$, are connected by a massless string over a frictionless pulley (Atwood machine). With $g=10{\text{m/s}}^2$, what is the magnitude of acceleration of the system?

A $0.10\text{kg}$ ball hits a wall at $20\text{m/s}$ and rebounds at $15\text{m/s}$ (opposite direction). The collision lasts $0.020\text{s}$. What is the average force the wall exerts on the ball?

A $2.0\text{kg}$ object on a string moves in a horizontal circle of radius $0.50\text{m}$ at $4.0\text{m/s}$. What is the tension in the string?

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?