80. We use the notation gas the acceleration due to gravity near the surface of Callisto, mas the mass of the landing craft, aas the acceleration of the landing craft, and Fas the rocket thrust. We take down to be the positive direction. Thus, Newton’s second law takes the form mg– F= ma. If the thrust is F1(= 3260 N), then the acceleration is zero, somg– F1= 0. If the thrust is F2(= 2200 N), then the acceleration is
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