A 2000 kg car has a speed of 23 mph at the top of a hill which is 144 m tall. How

fast will the car be going if it coasts to the bottom of the hill?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?

Relative to the ground below, how many joules of potential energy does a 1000-kg boulder have at the top of a 5-m ledge?