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When will displacement and velocity be negative ? Can you explain me about angular acceleration and angular velocity.
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The signs are conventional. We take one direction as positive and the direction opposite to it as negative.
When we discuss one-dimensional motion, it is easy to take the help of the number-line, whatever towards right is positive and towards left is negative. If the initial direction of motion is taken as positive and the further displacements does not make the body to go beyond the initial position in opposite direction, the displacement will be positive.