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Question
Draw a velocity versus time graph of a stone thrown vertically upwards and then coming downwards after attaining the maximum height.
Solution
When a stone is thrown vertically upwards, its velocity at the highest point is zero. As acceleration due to gravity (g) acts vertically downwards, so the upward motion of stone is uniformly decelerated and the downward motion is uniformly accelerated. This makes the velocity of stone while reaching ground equal to the initial velocity of stone. So the velocity-time graph will look like this.
Here, PQ corresponds to upward motion and QR corresponds to the downward motion of the stone.
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