Particle P and Q of mass 20 g and 40 g respectively are simultaeously projected from points A and B on the ground. The initial velocities of Pand Q make 45^(@) and 135^(@) angles respectively with the horizontal AB as shown in the fig. Each particle has an initial speed of 49m/s. The separation AB is 245 m. Both particles travel in the same verical plane and undergo a collision. After collision P retraces its path. Determine the position of Q when it hits ground. How much time after the collision does the particle Q take to reach the ground? (Take g=9.8m//s^(2))

Particle P and Q of mass 20 g and 40 g respectively are simultaeously

1.	Particle P and Q of mass 20 g and 40 g respectively are simultaeously projected from points A and B on the ground. The initial velocities of Pand Q make 45^(@) and 135^(@) angles respectively with the horizontal AB as shown in the fig. Each particle has an initial speed of 49m/s. The separation AB is 245 m. Both particles travel in the same verical plane and undergo a collision. After collision P retraces its path. Determine the position of Q when it hits ground. How much time after the collision does the particle Q take to reach the ground? (Take g=9.8m//s^(2))
Answer» ANSWER :61.25 m, 3.565 s