# Difficult Kinematics Problem

1. Sep 10, 2014

### cwheats

1. The problem statement, all variables and given/known data
In the figure, a ball is thrown leftward from the left edge of the roof, at height h above the ground. The ball hits the ground 1.07 s. later, at distance d = 27.5 m from the building and at angle θ = 67° with the horizontal.

(a) Find h

(b) What is the velocity at which the ball is thrown?
magnitude
angle ° relative to the horizontal

(c) Is that angle above or below the horizontal?

2. Relevant equations

3. The attempt at a solution

Ive been staring at this problem for a while now and am out of ideas any help would be greatly appreciated.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Sep 10, 2014

### blintaro

Did you try making a list of Δt, Δ(x or y), Vi, Vf, and a for both the x and the y directions, then seeing if you can apply a kinematic equation to solve for unknown variables?

For instance Vfy =sin67(magnitude of Vf) and Vfx = cos67(magnitude of Vf), so if you could use kinematics in one direction to solve for the magnitude of Vf, you would then know the final velocity in the other direction as well.