Answer
The kinetic energy of each pellet is $~~250~J$
Work Step by Step
We can find the kinetic energy of each pellet:
$K = \frac{1}{2}~m~v^2$
$K = \frac{1}{2}~(0.0020~kg)(500~m/s)^2$
$K = 250~J$
The kinetic energy of each pellet is $~~250~J$.