Question

A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration
Now Alex, enough already, draw picture with all forces.
There is one, the weight
F = - m g
so
F = m a = - m g
so
a = -g

THE WHOLE TIME, NOT JUST AT TOP

Now no more questions until you try yourself !!!!

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