In which item is energy stored in the form of gravitational potential energy? a. a slice of bread b. a compressed spring c. an apple on a tree d. a stretched bow string

The things that determine the amount of an object's gravitational potential energy are ...

-- mass of the object

-- gravitational acceleration in the place where the object is

-- height of the object above the ground or the floor

A). a slice of bread; No.  It's still a slice of bread even if it's on the ground.

B. A compressed spring; No.  It's still a compressed spring even if it's on the ground.

C. An apple on a tree; Yes !  It can't be an apple on a tree if it's on the ground.  

D. A stretched bow string; No.  It's still a stretched bowstring even if it's on the ground.

the amount of current in the coil

the part of the wave he is travelling on is the crest