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Three speed-time graphs are shown below....

Three speed-time graphs are shown below.



(i) A ball thrown vertically upwards and returning to the hand of the thrower ?
(ii) A body decelerating to a constant speed and accelerating.

Text Solution

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(i) Graph (a) represents the case of a ball thrown vertically upwards and returning to the hand of the thrower. At `t = 0`, speed is maximum. The speed decreases at a constant rate, becomes zero at maximum height. The ball then falls with a uniform acceleration till its speed becomes equal to speed of projection.
(ii) Graph ( c) represents deceleration of the body to some constant speed, and then accelerating after some time.
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