9) Which statement is correct about the potential energy of a car moving down a ramp? -Potential energy depends on the mass and velocity of the car.
-Potential energy remains constant because total energy is constant.
-Potential energy is highest when the car is released at the top of the ramp.
-Potential energy is highest when the car reaches the bottom of the ramp

10)In a closed system of a cannon and cannonball, which changes would both result in an increase in the kinetic energy of the cannonball when fired from the cannon?(
increase the mass of the cannon or decrease the mass of the cannonball

increase the mass of the cannon or increase the mass of the cannonball

decrease the mass of the cannon or increase the mass of the cannonball

decrease the mass of the cannon or decrease the mass of the cannonball