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Question

The figure shown depicts the distance travelled by a body as a function of time.
The average speed and maximum speed between 0 and 20s are

206562_2397d3fd3e6c44af880b392601cd9e34.png

A
1m/s, 2.0m/s respectively.
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B
1m/s, 1.6m/s respectively.
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C
2.0m/s, 2.6m/s respectively.
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D
1.3m/s, 2.0m/s respectively.
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Solution

The correct option is A 1m/s, 2.0m/s respectively.
we know that averege speed is =final distanceinitial distancet2t1
=2020
Therefore, the average speed =1m/s
Now, maximum speed from graph is between time t=10s and t=18s
Vmax=2041810
Therefore, the maximum speed =168=2m/s

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