1. The problem statement, all variables and given/known data A stone is thrown upward at an angle of 53° above the horizontal. Its maximum height above the release point is 24 m. What was the stone’s initial speed? Assume any effects of air resistance are negligible. 2. Relevant equations Emech=0 3. The attempt at a solution On my book's solution, I do not understand, why the V(y) component of the velocity is not taken into account. Also, the solution is not given in polar form, but the V(x) component was used at Hmax. My solution used the Y component of the velocity at Hmax and is 85m/s. I used conservation of Emech at initial position and Hmax. Thank you.