The momentum, in physics is defined as the product between the velocity and the mass of any object travelling in space.
[tex]p=mv[/tex]
So, in this case we have the mass and the velocity and therefore we can derive the linear momentum.
[tex]p_b = m_b v_b \\ p_b = (10)(5) \\ p_b=50 (kg)(m/s) [/tex]