Question in dynamics projectile motion

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abdo99
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Photo of a printed textbook page showing Problem 14 (a stone thrown to hit a bird, with a worked ratio u cos θ = v) and Problem 15 about a ball thrown past a wall, with handwritten u cos θ and u sin θ notes at lower left.


Attempt solution

Y=(vsinø)t-0.5gt^2
4=(vsinø)t-4,9t^2

But there is 3 variables!

Another eq is
X=(vcosø)t
6=(vcosø)t

But i did not found any away to solution
 
Hint: 1. The ball travels on a parabolic path.

2. If you know the max height of the ball, you can calculate the vertical and horizontal components of initial velocity.

Or, at least, that's how I managed to do it but there may be a simpler method/formula..
 
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I know that ,but i did not konw the maximum H
The rule is H=(u^2sin^2)/2g