The momentum of an object is given by the following equation:

Momentum (p) = mass (m) × velocity (v)

If the mass is doubled while the velocity remains the same, the momentum will also double.

Here's why:

* Original momentum: p = m * v

* New momentum: p' = (2m) * v = 2(m * v)

Therefore, the new momentum (p') is twice the original momentum (p).