Final answer:
The total momentum of the car and dumpster after the collision will be equal to the initial momentum of the car, which is 10,800 kg m/s.
Step-by-step explanation:
Momentum is defined as the product of an object's mass and its velocity. To calculate the total momentum of the car and dumpster after the collision, we need to consider the conservation of momentum. Since the dumpster is at rest initially, its momentum is zero. Therefore, the total momentum after the collision will be equal to the initial momentum of the car.
Given that the initial momentum of the car is 10,800 kg m/s, the total momentum after the collision will also be 10,800 kg m/s.