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[" Two boys are standing at the ends "A"...

[" Two boys are standing at the ends "A" and "B" of a ground "],[" where "AB=a" .The boy at "B" starts running in a direction "],[" perpendicular to "AB" with velocity "v_(1)" .The boy at "A" starts "],[" running simultaneously with velocity "v" and catches the "],[" other boy in a time "t" ,where "t" is "],[[" (a) "a/sqrt(v^(2)+v_(1)^(2))," (b) "a/(v+v_(1))],[" (c) "a/(v-v_(1))," (d) "sqrt(a^(2)/(v^(2)-v_(1)^(2)))]]

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