question_answer

A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration\[1.0\text{ }m/{{s}^{2}}\]. If \[g=\text{ }10\text{ }m{{s}^{-2}}\], the tension in the supporting cable is

A) 8600 N  

B) 9680 N

C) 11000 N  

D) 1200 N

Correct Answer: C

Solution :

[c] Total mass\[=(60+940)kg=1000\text{ }kg\] Let T be the tension in the supporting cable, Then \[T-1000g=1000\times 1\] \[\Rightarrow T=1000\times 11=11000\text{ N}\]