# Answer on Mechanics | Relativity Question for d4

Question #15770

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

Expert's answer

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.

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.

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