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Unformatted text preview: Whats the plan? Which concepts and when? momentum 1st arrow collision: Swing up: Swing down: 2nd collision: energy energy momentum v m m 1st collision: Draw what? p sys or p ? Well, dont know p f of either so. .. p sys,i = p sys,f = ? mv mv = Both ms moving with the same new v which is. .. mv = 2mv f v/2 h K g g K mgh = 1 / 2 mv f 2 h = v 2 8g Now what happens? Whats the p of the returning bob and arrow? Whats the p of the second arrow? mv mv p sys = 0!!! v f = v/2...
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