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It depends what it hits and the power of the gun.
No. It shows zero speed. Velocity is distance/unit time. The slope of the line shows change in distance / change in time. Since distance never changes as time changes, the change in distance is zero. Alternatively, the slope of a horizontal line is zero. If zero speed is considered "constant", then yes, it does show constant speed but the speed is zero.
The absolute value is the distance between a number and zero on a number line.
Its absolute value.
The distance from the number to zero (or the distance from zero to the number). Ignore the fact than one measure is positive and the other negative.