Two masses and hang vertically from the two ends of a light string passing over a frictionless, massless pulley (take ). What is the downward acceleration of mass ?
Answer and explanation
Correct answer: B.
- Step 1: Apply Newton's second law to the Atwood system: net driving force is .
- Step 2: Total accelerated inertia is .
- Step 3: Calculate acceleration: .
Answer
1.96 m/s^2.
Why not the others: '' is free-fall; '' divides by 2.5; '' divides by 10.
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