4. Define speed. Mention the SI unit of speed .
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Speed is defined as the rate of change of distance with time. It has the dimension of distance by time.
The SI unit of speed is given as the combination of the basic unit of distance and the basic unit of Time. Thus, the SI unit of Speed is meter per second.
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SI unit of speed = m/s, m s -1
In everyday use in kinematics, the speed of an object is the magnitude of change of its position, it is thud a scalar quantity
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