Q. 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 1.0 m/s². If g = 10 m s⁻², the tension in the supporting cable is
A) 1200 N
B) 8600 N
C) 9680 N
D) 11000 N
Explanation
[Solution from source] The cable accelerates the lift and the person together (total mass 1000 kg) upward at 1 m/s², so T − (M + m)g = (M + m)a, giving T = 1000 × (10 + 1) = 11000 N. Using only the lift's mass or ignoring the acceleration gives the smaller values. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.