physics

Imagine a landing carft approaching the surface of Callisto, one of Jupiture's moons. If the engine provides an upward force (thrust) of 3260 N, the craft descends at constant speed; if the engine provides only 2200 N the craft accelerates downward at .39 m/s^2. a) What is the weight of the landing craft in the vicinity of Callisto's surface? b) what is the mass of the craft? c)What is the magnutide of the free-fall acceleration near the surface of Callisto?

I need help. I can't figure out what to do I am confused.

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