ok i have a better one.?

Question

if a bowling ball was in a moving truck would it's energy be potential or kinetic

Answer 1

Compared to its floor mgh = 0 because h=0
Compared to the street mgh > 0, since h>0

Compared to its floor (1/2)mv2 = 0 because v(rel) = 0
Compared to the street (1/2)mv2 > 0 because v = v(truck)

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Answer 2

The truck is a moving mass so it has energy of motion.
The bowling ball is massive and its moving at the same speed as the truck so it also has energy of motion.
If the ball has a chance to fall off the truck from a ceratin height it would display a motional energy due to the gravity pressure its subjected at that elevation.
The Gravity energy that the ball acquired is called potential energy due do gravity pressure.
note In this case energy is directional . Its a vector.Since Energy had the same direction as the truck and when it fell straight sown due to gravity the path would be a moving vector which would be parabolic trajectory.
Whe the ball falls to the ground it would have the same value has the average kinetic energy that existed at the point of rest, which is potential energy.

Answer 3

Depends: If the bowling ball is rolling around the back of the truck it has kinetic energy. If the bowling ball is in a box (not moving) then it has potential energy.

Answer 4

Both kinetic and potential energy are relative measures.

So the ball has zero kinetic energy relative to the truck, but not relative to the ground.