When the drag force on an object falling through the air equals the force of gravity, the object has reached a) terminal force
b) terminal acceleration
c) gravity
d) acceleration

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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explanation: