Final answer:
The momentum of the 900 kg car traveling at 15.0 m/s east is 13,500 kg·m/s east, found by multiplying the car's mass by its velocity.
Step-by-step explanation:
The momentum of an object is calculated by multiplying its mass by its velocity. The formula for momentum (p) is p = mv, where m is the mass and v is the velocity. For a 900 kg car traveling east at 15.0 m/s, the momentum would be 13,500 kg·m/s east. Applying the formula:
p = m × v
= 900 kg × 15.0 m/s
= 13,500 kg·m/s east
So, the correct answer to the question is a) 13,500 kg·m/s east.