A body projected vertically up reaches a maximum height of 9.8 m. Its time of flight is g=9.8 m/s2

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answer is A.

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Detailed Solution

Given that maximum height H=9.8 m⇒u22g=9.8⇒u2=2×9.8×9.8⇒u=2×(9.8)2 =9.82m/s Time of flight T=2ug =29.8×9.82=22s

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