An 16 m tall vase is located 50 m in front of a lens. An image is produced 20 m away from the lens. What is the focal length?

What is the momentum of a 2 kg object moving at 15 meters per second

What is the measure of a change in an objects velocity?

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.