Monday, September 19, 2011

How to find the impulse?

Hey everyone,



I'm having a little bit of trouble with this physics problem:



You were driving a car with velocity %26lt;28, 0, 18%26gt; m/s. You quickly turned and braked, and your velocity became %26lt;12, 0, 18%26gt; m/s. The mass of the car was 1200 kg. The maneuver took 4 seconds.



I found the change in momentum vector, but now I need to find the impulse in vector format and the average net force in vector format. Any physicists out there?How to find the impulse?change of momentum=final momentum- initial momentum (in this case, the velocity)

so, x=(12-28)x1200kg=-19200(b/c momentum is a vector, the negative sign must included)

y=0, so it is still 0

z=(18-18)x1200=0

the answer will be %26lt;-19200,0,0%26gt;