A-LevelPhysicsDynamics9702/12 · Oct/Nov 2015 · Q121 Mark
A mass of 0.20 kg is suspended from the lower end of a light spring. A second mass of 0.10 kg is suspended from the first mass by a thread. The arrangement is allowed to come into static equilibrium and then the thread is burned through. [Figure showing a spring with 0.20kg mass, and 0.10kg mass suspended below by a thread] At this instant, what is the upward acceleration of the 0.20 kg mass? (Assume g = 10 ms⁻².)
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A5.0 ms⁻²
B6.7 ms⁻²
C10 ms⁻²
D15 ms⁻²
✓ Correct answer
A: 5.0 ms⁻²
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