A fire fighting vehicle of mass 12,000 kg is at rest but free to roll with no resistance. If you push it forward with a force of 500 N, the momentum at the end of 10 s of pushing will be
A) 5000 kg m/s.
B) 20,000 kg N/s.
C) 0.416 m/s.
D) zero.

Question

Quizplus · Accepted Answer

The momentum of an object is given by the product of its mass and velocity. When a force is applied to an object for a certain amount of time, it changes the object's momentum according to the impulse-momentum theorem, which states that the change in momentum (Δp) is equal to the impulse (force × time). Here, the impulse is 500 N × 10 s = 5000 Ns. Since 1 Ns = 1 kg m/s, the change in momentum is 5000 kg m/s.

A Fire Fighting Vehicle of Mass 12,000 Kg Is at Rest