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Homework Statement
A research balloon of total mass 220 kg is descending vertically with a downward acceleration of 4.3 m/s2. How much ballast must be thrown from the car to give the balloon an upward acceleration equal to 0.8 m/s2, presuming that the upward lift of the balloon does not change.
HINT: One body with two situations again. Draw sepatate FBD before and after the ballast is thrown out. Two equations from two FBDs.
Homework Equations
F=ma
The Attempt at a Solution
I don't know what forces I need to plug in which formula.