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)

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.