# 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.