To Determine the Height of a Flagpole,Abby Throws a Ball

Multiple Choice

To determine the height of a flagpole,Abby throws a ball straight up and times it.She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s.How high is the pole above the point where the ball was launched? Neglect air resistance.

A) 10 m
B) 13 m
C) 16 m
D) 18 m
E) 26 m