+234 8. A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. What is the magnitude of her horizontal displacement? (Assume no air resistance and that ay = -g = -9.81 m/s2.)
a. 4.6 m
b. 9.2 m
c. 13 m
d. 15 m
Answer's B but why.
