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    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
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