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CBSE Class 9 Answered

Four speed-time graphs are shown below. Which graph represents the following case: (a) A ball thrown vertically upwards and returning to the hand of the thrower? (b) A body decelerating to a constant speed and then accelerating?
Asked by Topperlearning User | 15 Jun, 2016, 01:15: PM
answered-by-expert Expert Answer

  1. 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 and becomes zero. The ball then falls with a uniform acceleration till its speed becomes equal to the speed of projection.

  2. Graph (d) represents deceleration of the body to some constant speed and then accelerating after some time.

Answered by | 15 Jun, 2016, 03:15: PM

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