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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?
Explanation
As the lift is moving downward directions so displacement is negative (zero). We have to see whether the motion is accelerating or retarding. Due to downward motion displacement is negative the lift reaches $4^{th}$ floor is about to stop hence, motion is retarding (-a) downward in nature hence, $x 0$. As displacement is in negative direction, $x < 0$ velocity will also be negative i.e., $v 0$, that can be shown in the graph.