JEE Main 2017 Physics question on Kinematics

When a body is thrown vertically upward, it decelerates uniformly due to gravity (g ≈ 9.8 m/s² downward) throughout the entire motion — both while going up and coming down. Taking upward as positive, the initial velocity is positive and decreases linearly at a constant rate, passes through zero at the highest point, then continues to become increasingly negative as the body falls back down. This gives a straight line with a constant negative slope crossing the time axis — which is exactly what option 2 shows. The graph is linear (not curved), confirming constant acceleration, and it crosses from positive to negative velocity, correctly representing the complete up-and-down journey.