I am stuck on a part of my physics hw, please help if you can(adsbygoogle = window.adsbygoogle || []).push({});

"Object A has mass mA = 7 kg and initial momentum vector pA,i = < 17, -8, 0 > kg · m/s, just before it strikes object B, which has mass mB = 11 kg. Just before the collision object B has initial momentum vector pB,i = < 3, 5, 0 > kg · m/s.

The forces that A and B exert on each other are very large but last for a very short time. If we choose a time interval from just before to just after the collision, what is the approximate value of the impulse applied to the two-object system due to forces exerted on the system by objects outside the system?"

i already calculated the total momentum of the system to be <20, -3, 0> kg m/s but i just cant figure out how to calculate the impulse without a given force or time.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Impulse, help!

**Physics Forums | Science Articles, Homework Help, Discussion**