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A person in an elevator accelerating upw...

A person in an elevator accelerating upwards with an acceleration of ` 2ms^(-2)` , tosses a coin vertically upwards with a speed of `20 ms^(-1)` . After how much time will the coin fall back into his hand ? (g = 10 `ms^(-2)`)

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The correct Answer is:
3
A person ……………
`t = (2v)/(g+a) = ((2xx21))/((10+4)) = (42)/(14) = 3 sec` .
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