Question
A 67.5kg skier slides down a 20° slope whose vertical height is 125m. What is the variation of the potential energy of the skier?
Answers
Damon
well it gives you the height, not the length, so you do not need the 20 degrees
- m g h = -67.5 * 9.81 * 125 Joules of gravitational potential energy lost.
By the way
if there is no friction, that is (1/2) m v^2 the increase in kinetic energy.
Now if you need to calculate friction forces, you need to use the 20 degrees.
- m g h = -67.5 * 9.81 * 125 Joules of gravitational potential energy lost.
By the way
if there is no friction, that is (1/2) m v^2 the increase in kinetic energy.
Now if you need to calculate friction forces, you need to use the 20 degrees.