Question

Question 21
Using following data, draw time - displacement graph for a moving object:



Use this graph to find average velocity for first 4 s, for next 4 s and for last 6 s.

Answer 1

Average velocity for first 4 s.
Average velocity = $\frac{changeindisplacement}{Totaltimetaken}$
$v=\frac{4-0}{4-0}=\frac{4}{4}=1m{s}^{-1}$
For next 4 s, $v=\frac{4-4}{8-4}=\frac{0}{4}=0m{s}^{-1}$
(or as x remains the same from 4 to 8 seconds, velocity is zero)
For last 6 s, $v=\frac{0-6}{16-10}=-1m{s}^{-1}$