A juggler throws a bowling pin straight up in the air. After the pin leaves his hand and while it is in the air, which statement is true? (a) The velocity of the pin is always in the same direction as its acceleration. (b) The velocity of the pin is never in the same direction as its acceleration. (c) The acceleration of the pin is zero. (d) The velocity of the pin is opposite its acceleration on the way up. (e) The velocity of the pin is in the same direction as its acceleration on the way up.

Chapter 8 Kinetic Energy- describes the motion of the object. It‘s given by the following formula: 1 2 K= mv 2 The SI unit for Kinetic Energy is a Joule which is equal to a N*m Potential Energy is another form of energy. It is given by: PE=mgh To find gravitational potential energy: m1m 2 U G( )G r To find the potential energy stored in a spring we use a formula to find the elastic potential energy: 1 2