Answer
$1~MeV/c = 5.33\times 10^{-22}~kg~m/s$
Work Step by Step
We can convert $1~MeV/c$ to units of $kg~m/s$:
$1~MeV/c\times \frac{1.60\times 10^{-13}~J}{1~MeV}\times \frac{c}{3.0\times 10^8~m/s} = 5.33\times 10^{-22}~kg~m/s$
Therefore:
$1~MeV/c = 5.33\times 10^{-22}~kg~m/s$
