What Is the Acceleration of a Baseball at Its Highest Point?

[lLovePhysics]

I'm confused with this problem:

A baseball is thrown straight upward. What is the ball's acceleration at its highest point?

I think that it would be gravity but its speed is 0 right?

When problems say that a ball is thrown up with an acceleration of 3 m/s^2, does the acceleration magnitude already include that of gravity? Because if not, wouldn't you need to subtract the 10m/s^2 of acceleration of gravity too?

 

[Doc Al]

I think that it would be gravity but its speed is 0 right?

So? What does the ball's speed have to do with its acceleration?

When problems say that a ball is thrown up with an acceleration of 3 m/s^2, does the acceleration magnitude already include that of gravity?

Once the ball leaves your hand, the only force on it is gravity (ignoring air resistance) and thus its acceleration is g downward.

While the ball is in your hand you can push on it, giving it an upward acceleration.