An object is projected upwards with a velocity of 100 m/s.The time after which it will strike the ground is (g = $10 m s^{- 2})$

10 sec

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20 sec

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15 sec

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5 sec

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Solution

The correct option is B
20 sec

Time of flight = $\frac{2 u}{g} = \frac{2 \times 100}{10} = 20 s e c$

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