energy

What are the units of PE and are they always the same?

PE is work done against a conservative force, so PE has the units of work.

What are the units of KE and are they always the same?

KE has units .5 m v^2 so the MKS units are kg * ( m/s )^2 = kg m^2 / s^2 or Joules, also units of work.

How do you base d'KE on the velocity as determined by horizontal range and distance of fall? The horizontal range is 42.5cm and the distance of fall is 94cm.

Find the horizontal velocity of the projectile by calculating time of fall and combining this with the horizontal range.
Find the `dKE from the fact that KE down the incline is initially 0, and finally equal to .5 m vf^2, where vf is the velocity as the ball goes off the end of the ramp.

energy

PE is work done against a conservative force, so PE has the units of work.

KE has units .5 m v^2 so the MKS units are kg * ( m/s )^2 = kg m^2 / s^2 or Joules, also units of work.

Find the horizontal velocity of the projectile by calculating time of fall and combining this with the horizontal range. Find the `dKE from the fact that KE down the incline is initially 0, and finally equal to .5 m vf^2, where vf is the velocity as the ball goes off the end of the ramp.

Find the horizontal velocity of the projectile by calculating time of fall and combining this with the horizontal range.
Find the `dKE from the fact that KE down the incline is initially 0, and finally equal to .5 m vf^2, where vf is the velocity as the ball goes off the end of the ramp.