What is the energy transformation taking place from right before the toy car is released until the toy car reaches the bottom of the track?me!

Ben(55 kg) is standing on very slippery ice when junior(25kg) bumps into him. junior was moving at a speed of 8m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision .

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places