Refer to the attached image!!!

The time of motion of the track star is determined as 0.837 s.
The time of motion of the track star is calculated as follows;
T = (2u sinθ)/g
where;
T = (2 x 12 x sin20)/9.8
T = 0.837 s
Learn more about time of motion here: https://brainly.com/question/2364404
#SPJ1