If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?
A)9.80 m/s2
B)7.35 m/s2
C)4.90 m/s2
D)2.45 m/s2
E)More information is needed to answer this question.

Question

Quizplus · Accepted Answer

At terminal speed, the net force is zero, so drag force equals gravitational force. At 30 m/s, the drag force is less than at terminal speed, so the net force is less than gravitational force, resulting in an acceleration less than 9.8 m/s². Using proportionality of speeds and forces, the acceleration is approximately 7.35 m/s².

If a 20-Kg Object Dropped in Air Has a Terminal