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

Particles P and Q of mass 20g and 40g respectively are simu ltaneously proejected from points A and B on the ground. The initial velocities of P and Q make `45^(@)` and `135^(@)` angles respectivley with the horizontal AB as shown in the Fig. 5.44 Each particle has an initial speed of 49m/s . the separation AB is 249m. both particles travel in the same vertical plane and undergo a collision. After collision P retraces its path. Determine the position of q when it hits the grou.d How much time after the collision does the particle Q take to reach the ground? (Take g`=9.8m//s^(2)`)

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The correct Answer is:
A, B, C, D
If a body drops from a height `H` above the ground then the time taken by it to reach the ground
` t = sqrt ((2H)/(g)) :. t = sqrt (( 2xx61.25)/(9.8)) = 3.53 s `
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