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From the velocity-time plot shown in Fig...

From the velocity-time plot shown in Fig. find the distance travelled by the particle during the first `40 s.` Also find the average velocity during this period.

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The correct Answer is:
A
From 0 to 20s,
displacement `s_1`=area under v-t graph
`+50 m` (as is negative)
From 20 to 40s,
displacement `s_2`=area under v-t graph
`=-50m` (as v is negative)
Total distance travelled =`s_1+|s_2|=100m`
Average velocity=`s/t=(s_1+s_2)/t`
`=(50-50)/40=0`
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