Answer to Question #15770 in Mechanics | Relativity for d4
If you throw a ball straight upward at a speed of 22 m/s, how long will it take to reach zero speed?
The velocity of the ball turns to zero at the top point of the trajectory. Let's denote the time elapsed to reach the highest point by T. Then
22[m/s] - 9.8[m/s²]*T = 0 ==> T = 22[m/s] / 9.8[m/s²] ≈ 2.24 s.
So, it will take about 2.24 seconds the ball to reach zero speed.