An object that has kinetic energy must be
a) moving.

b) elevated.
c) falling.

d) at rest.

option (A)

Explanation:

The energy possesed by the body by virtue of its motion is called kinetic energy.

Te formula for the kinetic energy is given by

K = 1/2 mv²

where, m is the mass of the body and v be the velocity of the body.

So, when a body is moving, it has some kinetic energy.

option (A)

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