NASA sends Lauren to an unknown planet (this is WY in the future). When she drops (think about the initial velocity if you drop something) a hammer on this planet, she discovers it takes 0.74 s to fall 3 m to the ground. What is the acceleration due to gravity on this unknown planet?

What is the angular momentum of the bar about the axle?

Which best describes the difference between internal and thermal energy?

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.