A crane exerts 56,000 Newtons of force over a distance of 4.5 meters. How much power was generated if it took 4.2 seconds to accomplish this

A man picks up a 50 kilogram block and carries it up a flight of stairs 10 meters high. He then carries the block back down the stairs and places the block in its original position. What is the NET work done on the block?

A motorist runs out of gas on a level road 170 m from a gas station. The driver pushes the 1,140 kg car to the gas station. If a 190 N force is required to keep the car moving, how much work (in J) does the driver do?

Person A and Person B are both using the same amount of work to lift something.  Person A takes half as much time to do it. Using the formula for power, explain which person has the most Power and why.

A man is pulling a sled (m-120 Kg) across the snowy tundra (see the figure below) by applying a force of 210 N at an angle of 9-18° with respect to the ground. He pulls the sled over a distance of 100 m. The sled started from rest and reached a final velocity of 6.8 m/s. How much work is done by the man on the sled measured in kJ? (1kJ = 1000J)

A 55 kg sprinter, starting from rest, runs 55 m in 7.0 s at constant acceleration.What is the sprinter's power output at 2.0 s, 4.0 s, and 6.0 s?

A motorist runs out of gas on a level road 210 m from a gas station. The driver pushes the 1,160 kg car to the gas station. If a 190 N force is required to keep the car moving, how much work (in J) does the driver do?