Select the correct answer. The motion of a car on a position-time graph is represented with a horizontal line. What does this indicate about the car's motion?
OA.
It's not moving.
OB It's moving at a constant speed.
OC. It's moving at a constant velocity.
OD. It's speeding up.

How many neutrons does plutonium -196 with an atomic number of 78.

The total amount of energy contained in an object

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.