Question

how you took -9.8 m/s^2

Answer 1

Hii..

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HERE IS YOUR ANSWER..

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9.8 m/s^2 is taken as the average value of acceleration due to gravity and - 9.8 m/s^2 is taken as retardation i.e. Negative acceleration. There is no way to take it because we have been taking it as it is. We can also take 10 m/s^2 but it is not as appropriate as 9.8 m/s^2.

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