Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. You drop the box. As it falls to its original level, its kinetic energy is 0 0. 04 J. O 100 J. O none of the above.

This is high school physics. Topic: Energy Conservation A 4000 kg roller coaster train full of riders approaches the loading dock at a speed of 12 m/s. It is abruptly decelerated to a speed of 6 m/s over a distance of 15 m. Determine the retarding force that acts upon the roller coaster cars.

A 72.0 kg swimmer jumps into the old swimming hole from a tree limb that is 3.75 m above the water. 1) Use energy conservation to find his speed just as he hits the water if he just holds his nose and drops in. Express your answer in meters per second.   2) Use energy conservation to find his speed just as he hits the water if he bravely jumps straight up (but just beyond the board!) at 2.20 m/s. Express your answer in meters per second.   3) Use energy conservation to find his speed just as he hits the water if he manages to jump downward at 2.20 m/s. Express your answer in meters per second.

A firefighter slides down a pole with constant speed. What can you say about the energy?