What is the value of acceleration due to gravity for a body moving against gravity if its velocity is positive?

9.8 m s^{- 2}

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Zero

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19.6 m s^{2}

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- 9.8 m s^{- 2}

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Solution

The correct option is D $- 9.8 m s^{- 2}$
As the body is moving against gravity, it means that it is moving away from Earth. The positive sign of velocity indicates that we have taken our sign-convention to keep the upward direction as positive. So, as the gravity acts in the downward direction, the value of acceleration due to gravity is -9.8 $m s^{- 2}$

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