<span>Kinetic energy is a body that possesses by
virtue of being in motion. While potential energy possesses a body by virtue of
its position relative to others, stresses within itself, electric charge, and
other factors. As the “car” moves along the track its kinetic energy coverts to
potential energy when it moves up or down one of the hills. With the initial motion
already pushing it when it reaches a slope or dip it uses its own motion to
move along the track. </span>
<span>For
my track I used cardboard and for my “car” I used a spool of thread. The weight
of the cardboard is about .13 kg and the spool is about 0.9</span>
<span>P.s. these were my answers and I got a pretty good grade, for the weight of the track and "car" I did estimate it.</span>
Just like the other elements, <span>iron (in a chemical form as Fe), can exist in more than one chemical form. The two most common forms for iron are Fe(II), in which the iron ion shares two of its electrons, and Fe(III), in which it shares three electrons. </span><span>The roman numerals are used to show the charge of a metal ion when an element can form different charges.
</span>So, the answer for this question is "<span>iron ions with a 2+ charge".</span>
Gravity has no effect on horizontal motion, but it causes accelerated vertical motion downward.
The result of this combination is that if the projectile is launched with ANY
horizontal motion ... not straight up or straight down ... then its motion from
the time it's launched until the time it hits the ground is always a part of a parabola.