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Throwing a ball straight up in the air. It will reach some peak where the velocity is zero, but the acceleration due to gravity is a constant -9.8m/s^2.
9.8 m/s2 ---------------------- Yes this is the average value of acceleration due to gravity near by the surface of the earth. As we go higher and higher level this g value decreases and becomes almost negligible. Same way as we go deeper and deeper the g value decreases and at the centre of the earth its value becomes zero.
The only number whose absolute value is zero is zero. This is because a number's absolute value is its distance from zero on the number line.
zero
The absolute value of zero is zero. The absolute value of any other real number - or even of any other complex number - is different from zero.