Question

A 1000 kg mass elevator has an acceleration of 1m/s

Answer 1

The mass of the lift is 1000kg, the acceleration is $1m/s^2$ and the acceleration due to gravity is $9.8m/s^2$

The tension developed in string is given as,

$T=mg+ma\\ =1000×9.8+1000×1\\ =10800N$

Thus, the tension developed in the string is 10800N.