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Q.

Find the value of rav from the graph shown below

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a

rav=+Δ[R]Δt

b

rav=−R2−R1t1−t2

c

rav=−d[R]dt

d

rav=−R2−R1t2−t1

answer is D.

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rav=−R2−R1t2−t1
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