Q21Long answer
Using following data, draw time - displacement graph for a moving object: Time (s) 0 2 4 6 8 10 12 14 16 Displacement (m) 0 2 4 4 4 6 4 2 0 Use this graph to find average velocity for first 4 s, for next 4 s and for last 6 s.
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Average velocity for first 4 s. Change in displa cement Average velocity = Total time taken 4−0 4 v= = = 1 m s–1 4−0 4 4−4 0 For next 4 s, v = = = 0 m s–1 8−4 4 (or as x remains the same from 4 to 8 seconds, velocity is zero) 0−6 For last 6 s, v = = –1 m s–1 16 − 10