A 1600 kg car is moving north with a speed of 25 m/s. An impulse of 10,000 N-s south is applied to the car. After the impulse is applied, the speed of the car is:

The speed of the car is 18.75 m/s

Explanation:

Impulse-Momentum Change Equation

The impulse received by an object is equal to the change in momentum:

Impulse = Change in momentum

The change in momentum is:

Where m is the mass of the object, v2 is the final speed, and v1 is the initial speed. This means the impulse J is:

It's given an m=1,600 kg car is moving at v1=25 m/s North and then an impulse of J=-10,000 N.s is applied South. The minus sign indicates the impulse is opposite to the original direction of the velocity.

Solving for v2:

Substituting:

The speed of the car is 18.75 m/s

there are no contact forces mentioned on the list of choices that you've provided.