Final answer:
The momentum of the dog weighing 18kg running at 0.63 m/s is 11.34 kg m/s.
Step-by-step explanation:
The momentum of an object is defined as the product of its mass and velocity.
In this case, the dog has a mass of 18 kg and a velocity of 0.63 m/s.
To calculate the momentum, we multiply the mass (18 kg) by the velocity (0.63 m/s):
Momentum = Mass x Velocity
Momentum = 18 kg x 0.63 m/s
Momentum = 11.34 kg m/s
Therefore, the momentum of the dog is 11.34 kg m/s.