Question

A lift is coming from 8th floor and is just
about to reach 4th floor. Taking ground floor as
origin and positive direction upwards for all
quantities, which one of the following is
correct?
(a) x<0, v<0, a > 0 (b) x > 0, v< 0, a < 0
(C) x > 0,7 <0, a > 0 (d) x > 0, v > 0, a < 0

Answer 1

Answer:

As the lift is coming in downward directions, displacement will be negative. We have to see whether the motion is accelerating or retarding. <br> We know that due to downward motion displacement will be negative. When the lift reaches

floor is about to stop hence, motion is retarding in nature hence,

. As displacement is in negative direction, velocity will alsobe negative i.e.,

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