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