Formula for momentum:

Momentum (p) = mass (m) * velocity (v)

Given:

* mass (m) = 9 kg

* velocity (v) = 1.5 m/s

Calculation:

* p = 9 kg * 1.5 m/s

* p = 13.5 kg·m/s

Therefore, the momentum of the 9 kg object moving at 1.5 m/s is 13.5 kg·m/s.