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$EXAMPLE 2.6 Figure 2.21 shows the distance-time graph of a moving car. From the graph find(a) the distance car has traveled.(b) the speed during the first five seconds.(c) average speed of the car.(d) speed during the last 5 seconds.Figure 2.21: Distance-time graph of a car in example 2.6$

$EXAMPLE 2.4 A car starts from rest. Its velocity becomes 20 \mathrm{~ms} in 8 \mathrm{~s} . Find its acceleration.$

$b) Why gravity is taken negative for an object moving in upward direction?$

$b) How represent vector quantities are represented graphically?$

$a) Define motion under gravity?$

$iv.If an object is moving with constant speed then its distance-time graph will be a straight line.(a) along time-axis(b) along distance-axis(c) parallel to time-axis(d) inclined to time-axis$

$EXAMPLE 2.12A bicycle accelerates at 1 \mathrm{~ms}^{-2} from an initial velocity of 4 \mathrm{~ms}^{-1} for 10 \mathrm{~s} . Find the distance moved by it during this interval of time.$