Understanding the Physics of Thrown Balls: Speed, Velocity, and Acceleration

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SUMMARY

When a ball is thrown vertically upward, it reaches a maximum height where both speed and velocity become zero, while acceleration remains constant at 9.8 m/s² due to gravitational force. The discussion clarifies that acceleration is the reason for the reduction in speed and velocity as the ball ascends. Thus, at the peak of its trajectory, the ball experiences zero speed and velocity, but continuous acceleration directed downward.

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A ball is thrown vertically upward. Consider the following quantities: 1)speed, 2)velocity and 3) acceleration. Which of these will be zero when the ball has reached the maximum height?

Won't all three be zero?
 
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Acceleration is never 0 on Earth...
Think about it this way, it's BECAUSE of the acceleration that the velocity & speed have become 0... 'cause the ball was moving up with some positive velocity along the y axis, and the acceleration acts downwards and thus reduces it.
 
I see...so the velocity and speed are 0 at the max height, but the acceleration is always 9.8m/s^2?
 

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