Question
A few speed-time graphs for non-uniform motion of objects moving along a straight line are shown in Figs. 8.48(a), (b), (c) and (d).
Tell how the speed is changing with time in each of these graphs? 
Solution
(a) Speed is increasing with time.
(b) Speed is decreasing with time.
(c) Speed is uniform.
(d) Speed is oscillating. That is, it alternately increases and decreases with the passage of time.
