# Net impulse and what objects exerts force

1. Mar 19, 2014

### savaphysics

1. The problem statement, all variables and given/known data
You are riding in a car that crashes into a solid wall. The car comes to a complete stop without bouncing back. The car has a mass of 1500 kg and has a speed of 30 m/s before the crash. (this is about 65 mi/hr).

What is the net impulse that acts on the car to bring it to a stop? What is the net impulse that
acts on you to bring you to a stop?

What object exerts the force that causes the impulse that brings the car to a stop? What object
exerts the force that causes the impulse that brings you to a stop?

2. Relevant equations

3. The attempt at a solution
I'm not to sure how to find the net impulse, Don't i need time?

Car to a stop= (1500kg) X (30/s)= 45000kg X 65=2925000

Object exerts force to bring the car to a stop is the wall.
Object that exerts force to bring me to a stop is the car.

2. Mar 20, 2014

### Simon Bridge

No. Check the definition of "impulse".

3. Mar 20, 2014

### savaphysics

thanks that really helped.....

4. Mar 20, 2014

### Simon Bridge

Sometimes a nudge is all it takes ;)
Enjoy.

5. Mar 21, 2014

### rude man

What happened to the impulse on the driver?