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

For this case, in the next item we have gravitational potential energy:

An apple in a tree.

Suppose we define our reference system at the floor level.

Suppose the apple is at a height h from the floor and has mass m.

The gravitational potential energy of the apple is given by:

U = mgh

Where,

m: apple mass

h: height of the apple with respect to the floor

g: acceleration due to gravity

C) an apple on a tree

seeing the graph would

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.