Potential Energy, Kinetic Energy, Average Speed and Final Speed


The blue track will have a greater average speed and will reach the bottom sooner. This is because it transforms its potential energy into kinetic energy sooner than the red track.


The red track will have a slower average speed and will reach the bottom later.


Both tracks will have the same final velocity (Vf) because the total drop for both tracks is the same. Assuming that friction is not a factor, then the final velocity will be 2.3 m/s.


If the ball starts from rest you can calculate the final velocity by using this equation:


Vf =


The acceleration due to gravity (9.8 m/s2) = g.

The drop measured in meters = d.


If a ball is moving, you must include kinetic energy and potential energy in your calculations.