Draw a velocity versus time graph of a stone thrown vertically upwards and then coming downwards after attaining the maximum height.

(N/A) When a stone is thrown vertically upwards,its initial velocity is at its maximum. As the stone rises,its velocity decreases due to the constant downward acceleration due to gravity $(g)$.
At the maximum height,the velocity of the stone becomes zero.
After reaching the maximum height,the stone begins to fall downwards. During this phase,its velocity increases in the downward direction until it hits the ground.
The velocity-time graph for this motion is a straight line with a negative slope,representing constant deceleration during the upward journey and constant acceleration during the downward journey.