As shown below, a 450-kg roller-coaster car starts from rest at point A at a height of 47 m the track, reaching point B and then rolls up a second hill where it reaches a height of 23 m at point C). What are the gravitational potential energy and kinetic energy of the car when it is at points A, B, and C? What are the velocities at point B and C?

Which type of basaltic lava flow has a fairly smooth

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.