A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 15m/s{\rm m}/{\rm s} when the hand is 2.0m{\rm m} above the ground.How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)

Answer 1

2.91s

Answer 2

idk man

Answer 3

3.2s

Answer 4

2.99