Edward C. answered 03/04/15
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Caltech Grad for math tutoring: Algebra through Calculus
Plug the numbers into the formula. It might help you to know that 1 newton = 1 kg-m/s^2 .
2050000 kg-m/s^2 = 40000 kg * a
a = 2050000 / 40000 (m/s^2) = 51.25 meters / second^2