Question

If you throw a ball straight upward at a speed of 22 m/s, how long will it take to reach zero speed?

Answer 1

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.