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Dear Aditya
In 90 degree it will cover one fourth of the perimeter
suppose speed is v then time taken t=2∏r/4v=∏r/2v
velocity=displacement/time
displacement=√r2+r2 =r√2
velocity=r√2/t = 2√2 v/∏
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AKASH GOYAL
AskiitiansExpert-IITD
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initial velocity is vi and final velocity is vj,,,,,so the net velocity is vj-vi,,,,whose magnitude is(v2+v2).5
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