A 1800 kg crate and a level floor has a coefficient of static friction of 0.75 and a coefficient of kinetic friction of 0.67. a. How hard can you push the crate until it starts moving?

b. Find the acceleration of the crate if someone pulls horizontally on the crate with a force of 20,000.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.