Answer:D
The momentum of an object is defined as the product of its mass and velocity. So, to calculate the momentum of an object with a mass of 750 kg and a velocity of 15 m/s, we can use the following formula:
Momentum = mass x velocity
Momentum = 750 kg x 15 m/s
Momentum = 11,250 kg m/s
Therefore, the momentum of the object is 11,250 kg m/s.