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Q.

A body travelling with uniform acceleration crosses two points A and B with velocities 20ms-1  and 30ms-1 , respectively. The speed of the body at midpoint of A and B is

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a

25ms-1

b

25.5ms-1

c

24ms-1

d

106ms−1

answer is B.

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Detailed Solution

(30)2=(20)2+2a(2s)Now ,v2=u2+2 as ⇒v2=(20)2+250⇒v2=650∴v=25.5ms−1
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A body travelling with uniform acceleration crosses two points A and B with velocities 20ms-1  and 30ms-1 , respectively. The speed of the body at midpoint of A and B is