Question

A lift is coming from gfloor and is just about to reach
4- floor. Taking ground floor as origin and positive
direction upwards for all quantities, which one of the
following is correct?
(a) x<0. u<0. a>0
(b) x>0. v<0, a< 0
(c) x>0, u<0, a>0
(d) x>0, v>0, a< 0​

Answer 1

Answer:

a is the correct ans..

Explanation:

As the lift is coming in downward directions, displacement will be negative. We have to see whether the motion is accelerating or retarding. We know that due to downward motion displacement will be negative. When the lift reaches 4th floor is about to stop hence, motion is retarding in nature hence, x<0,a>0.