Question

Find the mass of a car that has a speed of 25 m/s and a momentum of 45,000 kg x m/s:.

Answer 1

The formula for momentum is P = mv, therefore P is expressed in terms of mass times velocity. Your problem asks you to find the mass if you know the velocity and the momentum.
mass (in kg) = momentum (in terms of m * v) / velocity (m/s)
divide the 45,000 kg*(m/s) by 25 m/s and you should get the answer you need.