Pytels Dynamics 12.58: A projectile, launched with an initial v = 24 m/s at angle θ=60 degrees

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1. Aug 6, 2017

Alexanddros81

1. The problem statement, all variables and given/known data
A projectile launched at A with an initial velocity of 24 m/s at the angle θ=60deg, impacts the vertical wall at B. Neglecting air resistance, calculate the height h

2. Relevant equations

3. The attempt at a solution
Here is my solution

As you can see to find height h I assumed that $v_y=0$ in the second of Eqs. (f) and solved for time.
Is this correct or should I have solved first equation of (g) to find time and then solve for y?

2. Aug 6, 2017

haruspex

Then don't. There is no basis for such an assumption.
Yes, find t first.

3. Aug 7, 2017

kuruman

Look at your equations labeled (e). The first equation can be used to find an expression for t in terms of x and θ. Substitute that in the second equation and you will have y as a function of x and θ. Substitute the given numbers for x and θ to find h.

4. Aug 10, 2017

Alexanddros81

Can you check this?

5. Aug 10, 2017

cnh1995

It's correct.