Thank you for reporting, we will resolve it shortly
Q.
For a stationary object at $x=40\, m$, the position-time graph is
Motion in a Straight Line
Solution:
For a stationary object, the position-time graph is a straight line parallel to the time axis, so for the given object at $x=40 \,m , x-t$ graph is as shown below
This is shown in option (a).
