For 3b) since impulse= change in momentum so I did 11.7= 0.45(v)-0.45(15)
But I don't get why what I did is wrong
c) what does it mean to have something that's perfectly inelastic, elastic, inelastic or perfectly inelastic?
6a) I get everything until the last part where they combine Ub and Vb together to get the speed.
b) If you could show me a diagram for this question that would be extra helpful
7b) and I have no idea what 7b is about
Your help will be greatly appreciated plsss help me out
Why do people do it?