The work done by the mover on the object is +280 J

The work done by the mover on the object is -280 J

The work done by the mover depends on the mass of box

point W

point X

point y

point z

A car traveling at 80 mph

A tractor-trailer traveling at 80 mph

A cheetah running at 80 mph

a motorcycle traveling at 80 mph

Someone stops it

Kinetic energy gets converted to Potential energy as you are gaining more height.

Kinetic energy increases because more height at the top.

Velocity is increasing thus roller coaster slows down

$$KE\ =\ \frac{1}{2}v^2$$

$$KE\ =\ \frac{1}{2}mv^2$$

$$KE\ =\ \frac{1}{2}m^2v$$

PE = mg

PE = mh

PE = mgv

PE = mgh