why is acceleration due to gravity taken as -9.8 even for downward motion

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Q. The acceleration due to gravity of the ball at the highest point, considering downwards as negative, is

- 9.8 {m/s}^{2}

What is meant by the statement that acceleration due to gravity is 9.8m/s²?

Q. Take upwards as positive, when a ball is thrown upwards, the acceleration due to gravity is during the upward motion and during the downward motion.

Q. The acceleration due to gravity

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as you go downwards

Sometimes we use 9.8 $m / s^{2}$ for the value of acceleration due to gravity and sometimes we use 10 $m / s^{2}$ for the value of acceleration due to gravity. What is the reason behind this?

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