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Q. The $x-t$ plot shown in the figure below describes the motion of the particle, along $x-axis$, between two positions $A$ and $B$. The particle passes through two intermediate points $P_1$ and $P_2$ as shown in the figurePhysics Question Image

KEAMKEAM 2017Motion in a Straight Line

Solution:

According to the figure, the displacement at point $P_{1}$ is increasing, so velocity at $P_{1}$ will be positive.
At point $P_{2}$, displacement is decreasing, so the instantaneous velocity will be negative.