Q. The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is:
A) 4 m s⁻² upwards
B) 4 m s⁻² downwards
C) 14 m s⁻² upwards
D) 30 m s⁻² downwards
Explanation
[Solution from source] T − mg = ma gives 28000 − 2000 × 10 = 2000a, so a = 4 m s⁻² upwards. The tension exceeds the weight, so the acceleration must be upward; 14 m s⁻² ignores gravity. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.