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p = p 0 x
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0 0
pB = pB x B = pB (1− x A )
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P pA + pB (6 -3)
P − p0
ฬ±(6 -2) t(6 -3) ]² B
xA = x = 0 0 (6-4)
pA − pB
p0
y = y = A x (6 -5a)
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p0
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vA = pA xA , vB = pB xB (6-9)
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vA vB
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y x
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y B x B
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