Question

Which has more momentum, an object with a mass of `5kg` moving at `15m/s` or an object with a mass of `20kg` moving at `17m/s`?

Answer 1

I would go for the object with bigger mass and velocity.

Explanation:

Momentum `vecp` is given, along the `x` axis, as:
`p=mv`
so:
Object 1: `p_1=5*15=75kgm/s`
Object 2: `p_2=20*17=340kgm/s`

You can "see" momentum by thinking of catching a ball with your hands:
here you compare catching a basketball and an iron cannonball; even if the velocities aren't so different, the masses are quite different...!