A Track Star in the Broad Jump Goes into the Jump

Multiple Choice

A track star in the broad jump goes into the jump at 10 m/s and launches himself at 20 $\degree$ above the horizontal. How long is he in the air before returning to Earth? Note: g = 9.8 m/s².

A) 0.35 s
B) 0.42 s
C) 0.70 s
D) 0.89 s