7. The potential energy is equal to 930 J when you are on roller blades on top of a small hill. Your mass is 45 kg. a). Calculate your weight in Newtons. [2]. b). What is the height of the hill? [2] c). Calculate your speed if you start skating down this hill. [2] *

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )