Answer to Question #16039 in Mechanics | Relativity for Christopher Chase
You throw a ball straight up with a speed of 15 m/s. How long will it take the ball to come back to your hand?
It will take
t = V0/g = 15[m/s]/9.8[m/s²] ≈ 1.53 seconds
to reach the top point and the same time will be elapsed to come back. So, the total time will be
T = 2t = 2*1.53[s] = 3.06 seconds.