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A ball is projected vertically upward with speed 20 m/s. The average speed of the ball, during its complete journey will be

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20 m/s

15 m/s

Zero

10 m/s

answer is A.

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Detailed Solution

$V_{avg} = \frac{s_{total}}{t_{total}} = \frac{2 (u^{2} / 2 g)}{(2 u / g)} = \frac{u}{2} = 10 {ms}^{- 1}$

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