Physics Guide
Sign in
Back to Problems
F = ma (First 10)
Simple Harmonic Motion
FMA-2020B-09 · 2020B F = ma (AAPT)

2020 F = ma Exam B — Question 9

Two equal masses m are connected by an elastic string that acts like an ideal spring with spring constant k and unstretched length l. The two masses are hung over a frictionless pulley. What is the total length of the string at equilibrium? (Diagram not necessarily to scale.) m m
Source: Question 9, 2020 F = ma Exam B, © 2020 American Association of Physics Teachers (AAPT) and the U.S. Physics Team. Adapted by PhysicsTrainer: reformatted into a separate question and answer choices for online multiple-choice practice; any shared setup from nearby questions is repeated here. Not affiliated with or endorsed by AAPT or the U.S. Physics Team.