Two balls B_(1) and B_(2) having difference but unknown masses collide. B_(1) is initially at rest and B_(2) has a speed u. After collision B_(2) has a speed u/2 and moves at right angles to its original motion. Find the direction (with respect to initial direction of B_(2)) in which ball B_(1) moves after collision

Two balls B_(1) and B_(2) having difference but unknown masses collide

1.	Two balls B_(1) and B_(2) having difference but unknown masses collide. B_(1) is initially at rest and B_(2) has a speed u. After collision B_(2) has a speed u/2 and moves at right angles to its original motion. Find the direction (with respect to initial direction of B_(2)) in which ball B_(1) moves after collision
Answer» `TAN^(-1)((1)/(2))` `tan^(-1)(2)` `tan^(-1)((1)/(4))` `tan^(-1)(4)` ANSWER :A