The diagram shows a velocity-time graph for a car moving in a straight line. At point Q the car must be: 
Definitions:
Astigmatism
An imperfection in the curvature of the eye's cornea or lens, leading to blurred or distorted vision.
Cornea
The transparent front part of the eye that covers the iris, pupil, and anterior chamber, contributing to the eye's optical power.
Eyeball
The globe-shaped part of the eye housed within the orbit, containing the structures necessary for vision.
Optic Nerve
The cranial nerve that transmits visual information from the retina to the brain.
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