250kg roller coaster cart is at the top of a 15m hill and is moving at 30 m/s before it drops to a height of 5 m above the ground. What is the velocity of the cart at the top of this smaller hill?

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

The air that we breath is made mostly of which gaseous molecule