Question

What is the momentum of a 37-kg person riding south on an 18-kg bicycle at 1.2 m/s

Answer 1

The equation of momentum is:

$p=mv$

Where p is the momentum, m is the mass and v is the velocity.  In this case the mass of the person and the mass of the bike so:

$m_{total}=mass_{person}+mass_{bike}=37kg+18kg=55kg$

And the velocity of the person riding the bike is 1.2 m/s and so:

$p=(55kg)(1.2m/s)=66 \frac{kgm}{s}$