A ball is thrown vertically upward. What is its acceleration a) after it has left the thrower's hand and is traveling upward? b) at the instant it reaches the top of its flight? c) on its way down? I am aware that 9.8 m/s^2 is the acceleration due to the gravity, which is the answer for all of the questions. But why?

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anonymous · Answer

Gravity exerts a force on all objects as you very well know. This force happens to be 9.8 Newtons.