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Particles P and Q of mass 20 gm and 40 g...

Particles P and Q of mass 20 gm and 40 gm respectively are simultaneously projected from points A and B on the ground. The initial velocities of P and Q make `45^@ and 135^@` angles respectively with the horizontal AB as shown in the figure. Each particle has an initial speed of 49 m/s. The separation AB is 245 m. Both particles travel in the same vertical plane and undergo a collision. After the collision, P retraces its path. How much time after the collision does the particle Q take to reach the ground?

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61.25 m, 3.565 s
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