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Unformatted text preview: Momentum conservation gives: (1) m 1 v 1i + m 2 v 2i = m 1 v 1f + m 2 v 2f Energy conservation leads to: (2) v 1i + v 1f = v 2i + v 2f (sum of initial and final velocities is conserved) In our case, equ. (1) gives: (6)(25) + (12)(20) = 6 v 1f + 12 v 2f or 6 v 1f + 12 v 2f = 90 Equ. (2) gives: 25 + v 1f = 20 + v 2f or v 1f v 2f = 45 Multiplying the second equation by 12 and adding gives: 18 v 1f = 630 or v 1f = 35 cm/s From this, we find v 2f = 10 cm/s...
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 Spring '06
 Buchler
 Physics, Kinetic Energy, Momentum, Work, V2F, v1f

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