A compressed spring has 16 J of potential energy. What is the maximum speed it can impart to a 2 kg object?

A construction laborer holds a 20 kg sheet of wallboard 3 m above the floor for 4 seconds. During these 4 seconds how much power was expended on the wallboard?

If M represents units of mass, L represents units of length, and T represents units of time, the dimensions of power would be:

An automobile engine delivers 24000 watts of power to a car’s driving wheels. If the car maintains a constant speed of 30 m/s, what is the magnitude of the retarding force acting on the car?

A person pushes a box across a horizontal surface at a constant speed of 0.5 meter per second. The box has a mass of 40 kilograms, and the coefficient of sliding friction is 0.25. The power supplied to the box by the person is

A horizontal force F is used to pull a 5-kilogram block across a floor at a constant speed of 3 meters per second. The frictional force between the block and the floor is 10 newtons. The work done by the force F in 1 minute is most nearly:

A weight lifter lifts a mass m at constant speed to a height h in time t. What is the average power output of the weight lifter?

A bulldozer pushes a rock with a constant force of 1500N and the rock moves 5m in 10s. How much power is used to move the rock in this time?

A car of mass 700kg is at rest and begins to accelerate forward with a power of 80hp. Ignoring all rotational accelerations, what is the instantaneous linear acceleration of the car?

1hp = 745.7 W