For a freely falling body,
where g is acceleration due to gravity and t is time.
= 20 m/s
(Thus in 2s body would travel a distance of 40 m from release point)
Kinetic Energy K=1/2 mv²
So K= 1/2 * 2 *20²
= 1 * 400
= 400 J
Thus the Kinetic Energy of the body would be 400 J at the end of 2s.