Well, it's carrying a few different kinds of energy.
-- It's carrying thermal (heat) energy because
its temperature is warmer than Absolute Zero.
-- It may be carrying chemical energy, which will
come out of it when you burn it.
-- It has kinetic energy because it's moving.
I think this is the one you're thinking of, because
you told us its mass and how fast it's moving.
You can never create energy where there isn't any, and you can never
destroy energy or cancel it out. Energy just moves around from place
to place, or from one object to another one. In order to make the object
move at that speed, somebody had to GIVE it that kinetic energy ... like
maybe by throwing it. When it loses some kinetic energy somehow, it'll
slow down, and when it loses ALL of its kinetic energy, it'll stop.
The kinetic energy of a moving object is
(1/2) · (the object's mass) · (its speed squared) .
So for the object you're describing, its kinetic energy is
(1/2) · (1 kg) · (20 m/s)²
= 200 joules .
