Can You Solve the Problem of Projectiles with These Equations?

[AIshikrakshit]

Homework Statement

Homework Equations

$$h=ut+1/2at^2$$ $$h=x\tan\theta-1/2g\frac{x^2}{u^2\cos^2\theta}$$

The Attempt at a Solution

I tried to take a random angle theta for the lower particee and then using the equation of the upper particle tried to solve them together and find condition for tangency

 

[phinds]

1) on this forum, "show your work" doesn't mean state that you have done some work, it means SHOW the work
2) what do you know about the point where particle Q hits the ground in terms of the initial speed of particle P?
3) what do you know about the starting point of particle Q in terms of the initial speed of particle P?