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 -

1. A. a v 2+v 1 2
2. B. a 2 v 2-v 1 2
3. C. a (v-v 1)
4. D. a (v+v 1)

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