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 ms^(-2)`, the tension in the supporting cable is

Options

A. `86 00 N`
B. `9680 N`
C. `1100 N`
D. `1200 N`

Answer

C

Explanation

Here , mass of a person `, m= 60 kg `
mass of lift `, m= 940 kg , a= 1 m//s^2, , g= 10 m//s^2`
Let T be the tension in the supporting cable
` therefore T - (M +m ) g= ( M+m) a`
` T=(M+m) (a +g)`
` =( 940 + 60 )( 1+10 )= 11000 N`