Problem 1 (Gravitational Potential Energy)

7.5 of text:

A baseball is thrown from the roof of a 22.0 m tall building with an initial velocity of magnitude

12.0 m/s and directed at an angle of 53.1° 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 to part (a) if the initial velocity is at an angle of 53.1° below the horizontal? (c) If the

effects of air resistance are included will part (a) or (b) give the higher speed?