Please, can anyone explain how to solve the last problem

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Is it as simple as subtraction? Because it's a frictionless surface there would be no lost energy so the kinetic energy of the bullet would be transferred to the flour?

So if that's right: the bag is moving at 185m/s?

CheshireCatalyst · 36-40, M

@CheshireCatalyst mine is wrong. I forgot how to maths