JEE Main Physics question
With what minimum acceleration can a fireman slide down a rope whose breaking strength is 2/3 of his weight?
Answer: (C)
Solution
Tension while sliding with acceleration a: T = m(g−a). Requiring T ≤ (2/3)mg gives g − a ≤ 2g/3, so a ≥ g/3; the minimum is g/3.