The net force on the elevator is 3200x4 Newtons. This comprises the sum of

a downward force due to gravity of 3200xg, and the upward force equal to

the tension in the cables, so:

3200x4 = T-3200xg,

so:

T = 3200(4 + g).

Opps.. lbs not kg, so the elevator mass is ~3200*.4536 ~=1451.5 kg

and ft/s not m/s, so ~4 ft/s 4*0.3048 ~=1.22 m/s

so we have:

T= 1451.5(1.22+g)~=16010 Newtons.

I would recomend to your instructor that they stop using customary units immeadiatly

the confusion in the system between the units of mass/weight at the very risky and

confusing.

RonL