Answer
$14.07\times 10^2\frac{m}{s}$
Work Step by Step
We know that
$\lambda=\frac{h}{p}=\frac{h}{mv}$
This can be rearranged as
$v=\frac{h}{m\lambda}$
We plug in the known values to obtain:
$v=\frac{6.63\times 10^{-34}}{1.67\times 10^{-27}\times 0.282\times 10^{-9}}$
$v=14.07\times 10^2\frac{m}{s}$