Question

AN ELEVATOR THAT WEIGHS 3000 N IS ACCELERATED UPWARD AT 1 M/S2. WHAT FORCE DOES THE CABLE EXERT TO GIVE IT THIS ACCELERATION ?

Answer 1

Given:

$mg=3000\:\rm N$

$a=1\:\rm m/s^2$

The tension in a cable

$$T=ma+mg=mg(1+a/g)\\ =3000*(1+1/9.8)=3306\:\rm N$$