I understand - you don't need to make one of the numbers negative because the number you are looking for, velocity, is the answer, i.e. different to the first question.
I'll try some practice questions.
Thanks for your help.
Thanks, kinda makes sense.
"A gun fires a bullet as shown. At what speed does the gun move backwards?"
Bullet Velocity = 150 m/s
Bullet Mass = 0.01 kg
Gun Velocity = V
Gun Mass = 1 kg
The book says you should work it out as below:
1) Choose which direction is positive, he...
Thanks for the response. I understand that they are both vector quantities but I don't really understand the effect of making one momentum negative has on that.
Also, another question is about the recoil of a gun being fired, yet there are no negative figures used when working out the...
First off, this isn't homework, I need to re-learn GCSE physics from a textbook and am having trouble with a few aspects of momentum.
Homework Statement
Two people are skating towards each other. The person on the left has a mass of 80kg and is skating at 2 m/s. The person on the right is...