JEE Main Physics question
A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on the control panel. The lift starts moving upwards with an acceleration of 1.0 m/s². If g = 10 ms⁻², the tension in the supporting cable is
Answer: (D)
Solution
Total mass (lift + person) = 940 + 60 = 1000 kg. T − Mg = Ma ⟹ T = M(g+a) = 1000 × (10+1) = 11000 N.