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 \[1.0\,\,m/{{s}^{2}}\]. If \[g=10\,\,m/{{s}^{2}},\] the tension in the supporting cable is

A)  9680 N                

B)         11000 N              

C)         1200 N                

D)         8600 N

Correct Answer: B

Solution :

Total mass = Mass of lift + Mass of person = 940 + 60 =1000 kg T - mg = ma Hence, \[T-1000\times 10=1000\times 1\] T = 11000 N