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Question

The graph below shows the velocity of a particle moving in a straight line.
The ratio of average speed and average velocity of the particle in the time interval from t=0 to t=6

1357060_4f5e1f1925d74ea39a5b5ba06c5afb95.png

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Solution

avjspeed=totaldistancetotaltimeavjvelocity=totaldisplacementtotaltime
Displacement=Area under graph
Displacement fice t=6s=10×3+12×10×512×5×1
=45/2+30=105/2
Distance fice t=6s=|10×3|+(12×10×5)+(12×5×1)
=30+502+52=1152
Average speed=distance=115=23
average velocity=distance=105=21

1232126_1357060_ans_5eb95491b86e4cdf9d8eadde3b7e687b.png

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