Im having trouble with this homework problem, Its just that the formua throws me off, and I cant figure out what is asking.

#7. According to the Theory of Relativity the energy E of a body with mass "m" is given as a function of its speed "v" by

Where c is constant, the speed of light.

A. Assuming v< c, expand E as a series in (V/C) to the second nonzero term.

B. Explain why (v/c) is very small, then E can be well approximated by

E=1/2 mv^2