Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?