AP · AP C:M · multiple choice
AP Physics C: Mechanics · Question 2
AP Physics C: Mechanics · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 1
- Topics
- 1
- Answer
- Complete
multiple choice1 mark
An object of mass m falls from rest through a fluid that exerts a resistive force of magnitude bv, where v is the speed. What is the terminal speed?
- A
b/(mg)
- B
mg/b
- C
√(mg/b)
- D
mgb
Ready to self-mark?Reveal the detailed answer guide
Answer overviewCorrect answer: B — mg/b
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is B: mg/b
- 2
C is the terminal speed for a resistive force proportional to v², and is the answer of a candidate who reaches for the more familiar quadratic drag law without reading the exponent given.
Private on this device