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Answered 2012-08-28 16:35:24
When we throw the object upwards we consider that upward direction as positive.
Therefore, the velocity in that direction is positive but the acceleration due to gravity is in the opposite direction and so it is considered negative.
But when the ball comes down again after reaching a certain height the velocity is in opposite direction to the earlier one and so the velocity now is negative as a result the acceleration is again negative.
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