Since, units of length, velocity and force are, doubled.

Hence,

$\left[\mathrm{m}\right]=\frac{\left[\text{ force }\right]\left[\text{ time }\right]}{\left[\text{ velocity }\right]}\left[\text{ time }\right]=\frac{\left[\text{ lengh }\right]}{\left[\text{ velocity }\right]}$

Hence, unit of mass and time remain same. Momentum is doubled.