Final answer:
To find the velocity of a 1500 kg car with 4500 kgm/s of momentum, divide the momentum by the mass, yielding a velocity of 3 m/s.
Step-by-step explanation:
The magnitude of velocity for a 1500 kg car possessing 4500 kgm/s of momentum can be found using the formula for momentum, p = mv, where p is momentum, m is mass, and v is velocity. By rearranging the formula to solve for velocity, we get v = p/m. Substituting the given values, we get v = 4500 kgm/s ÷ 1500 kg. Therefore, the velocity of the car is 3 m/s.