Answer to Question #74040 in Classical Mechanics for ADP

Question

A particleA is dropped from a point P at t=0. At the same time another particleB is thrown from a point O which is 2m to the right and 10m below P , with velocity v making an angle @ with horizontal.
B collides with the particle A . If the two particles collide 2 sec after they start,find v.
(Acceleration due to gravity is 10m/s in negative y direction. Point O in not necessarily on ground.)
Ans- (root)26

Please help me solve this using x and y components of v. And also where would they collide?