Define acceleration and state its SI unit. For motion along a straight line, when do we consider the acceleration to be (i) positive (ii) negative? Give an example of a body in uniform acceleration.
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Acceleration is the rate of change of velocity per unit time. Its SI unit is m/s². When the velocity of the body is increasing, acceleration is positive and vice versa. Example of a body in uniform acceleration is a falling freely under influence of gravity.
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Acceleration is a vector quantity that is defined as the rate at which the object changes its velocity . An object is accelerating of it is changing its velocity. The SI unit of acceleration if m/s².
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