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## Homework Statement

A baseball is thrown from the roof of a building of height 21.2m with an initial velocity of magnitude 10.7 m/s and directed at an angle of 54.4 degrees above the horizontal.

a. What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air resistance.

b.What is the answer for part (A) if the initial velocity is at an angle of 54.4 below the horizontal?

## Homework Equations

PE=mgh

KE=1/2mv^2

KEi+PEi=KEf+PEf

## The Attempt at a Solution

I'm not exactly sure where to begin. I'm thinking I have to find the max height the ball achieves using projectile motion methods then use conservation of energy?