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[QUOTE="haruspex, post: 5503215, member: 334404"] The problem with those two conservation laws here is that you have an unknown impulse from the step. So you need to find a way of applying one of them in which that impulse makes no contribution. If you knew the direction of the impulse you could consider momentum orthogonal to it; but you don't. Angular momentum is always relative to some chosen axis. Can you choose an axis such that the impulse has no moment about it? [/QUOTE]
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