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Particles P and Q of masses 20g and 40g,...

Particles `P` and `Q` of masses `20g` and `40g`, respectively, are projected from positions `A` and `B` on the ground. The initial velocities of `P` and `Q` make angles of `45^(circ)` and `135^(circ)`, respectively with the horizontal as shown in the fig. Each particle has an initial speed of `49m//s`. The separation `AB` is `245m`. Both particles travel in the same vertical plane and undergo a collision. After the collision `P` retraces its path. The separation of `Q` from its initial position when it hits the ground is

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