Question

A
2-
kg
metal ball is rolling at
4

m
/
s
toward a
3-
kg
brick that is not moving. Identify the momentum of both objects in
kg
⋅
m
s
2
.

Answer 1

Momentum = mass × velocity.

- Metal ball: p = 2 kg × 4 m/s = 8 kg·m/s (toward the brick).
- Brick: p = 3 kg × 0 m/s = 0 kg·m/s.

(Note: momentum units are kg·m/s, not kg·m·s^2.)