Velocity is positive when the body moves in the positive direction of axis.Sign convention for velocity is normally as follows:.Its value is given by the same expression in both, the x and the y axis: The velocity of the body is defined by the scalar v. Equation of position in vertical rectilinear motion: If it is below, the coordinate is negative. Normally the following convention of signs for the position is followed: If the body is above the origin, the y-coordinate is positive. Y-coordinate, in the case of vertical movements. Equation of position in horizontal rectilinear motion: If it is on the left side, the coordinate is negative. Normally the following convention of signs for the position is followed: If the body is found to the right of the origin, the coordinate is positive. X-coordinate, in the case of horizontal movements.
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