Question

Particles P and Q of mass 20 g and 40 g respectively are
simultaneously projected from points A and B on the ground.
The initial velocities of P and Q make 45${}^{\circ }$ and 135${}^{\circ }$ 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.
(a) Determine the position Q where it hits the ground.
(b) How much time after the collision does the particle Q take
to reach the ground? (Take g = 9.8m/s${}^2$).

Answer 1

Answer: 3.53