Abby Throws a Ball Straight Up and Times It

Multiple Choice

Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s. What was the
Speed of the ball at launch? Neglect air resistance.

A) 48 m/s
B) 11 m/s
C) 34 m/s
D) 23 m/s
E) 45 m/s