Energy

Which of the following scenarios best represents a closed system?

What is the kinetic energy of a 4 kg object moving at 6 m/s?

If the velocity of an object triples, how does its kinetic energy change?

A car exerts a force of 750 N while moving at a constant velocity of 25 m/s. What is the power output of the car?

A force of 25 N is applied to move an object 8 meters horizontally. How much work is done by the force on the object?

What is the gravitational potential energy of a 2 kg object at a height of 15 meters above the ground (assume g = 9.8 m/s²)?

A spring with a spring constant of 200 N/m is compressed by 0.2 meters. What is the elastic potential energy stored in the spring?

If 300 J of work is done in 15 seconds, what is the power?

A person pulls a sled with a force of 40 N at an angle of 60 degrees to the horizontal. How much work is done if the sled moves 15 meters?

A block slides down a ramp with friction. Calculate the final velocity of the block given the initial height $h$, ramp angle $\theta$, coefficient of friction $\mu$, and the length of the ramp $L$.