MCAT Physics Question 27: Answer and Explanation
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Question: 27
12. A parachutist jumps from a plane. Beginning at the point when she reaches terminal velocity, which of the following is/are true?
I. The jumper is in translational equilibrium.
II. The jumper is not being acted upon by any forces.
III. There is an equal amount of work being done by gravity and air resistance.
- A. I only
- B. I and III only
- C. II and III only
- D. I, II, and III
Correct Answer: B
Explanation:
At terminal velocity, the force of gravity and force of air resistance are equal in magnitude, leading to translational equilibrium. Thus, statement I is true. If these forces have the same magnitude and act over the same displacement, then the work performed is the same as well, making statement III true. Even though the net force is equal to zero, there are still forces acting on the parachutist, making statement II false.