Question

If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may be 

(a) going up with increasing speed 

(b) going down with increasing speed 

(c) going up with uniform speed 

(d) going down with uniform speed.

Answer 1

(c) going up with uniform speed
(d) going down with uniform speed.

Explanation:

In both (c) and (d), acceleration is zero.

So, T=mg