Given the mass of the biker is m = 75.0 kg.
The constant velocity is v = 5.00 m/s.
The momentum of the biker is calculated by the formula.
[tex]p=mv[/tex]Put the given values,
[tex]\begin{gathered} p=(75.0kg)\times(5.00\text{ m/s)} \\ p=375kg\text{ m/s} \end{gathered}[/tex]Thus, the biker's momentum is p = 375 kg m/s.