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here's the formula I am using: [tex]v_f = v_i + v_{ex}*ln{\frac{M_i}{M_f}}[/tex]

well since it's at rest, initial velocity is zero. so...

[tex]v_f = 1.8*ln(750/2500)[/tex] which turns out to be 2.2 km/s. but the book says the answer is 2.7km/s