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Question
Define speed. What is its S.I. unit?
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Solution
The speed of a body is the rate of change of distance with time.
Its SI unit is metre/second (m/s).
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(i) In speed time graph uniform motion is given by a straight line parallel to x axis so figure (a) denotes the uniform motion.
(ii) In speed time graph motion with increasing speed is shown by straight line with positive slope so figure (c) denotes the motion with speed increasing.
(iii) In speed time graph motion with decreasing speed is shown by straight line with negative slope so figure (b) denotes the motion with speed decreasing.
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