David starts at rest and increase it's speed to 10 m/s in 10s. what is it's acceleration?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

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.

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? a b c d