Question

a) A stone is thrown straight up into the air. When the stone turns, its instantaneous...

a) A stone is thrown straight up into the air. When the stone turns, its instantaneous speed is 0.
How big is its acceleration?
b) Whilst a high-speed ball fires horizontally, a similar ball is released
from the same height. Which bullet is on the ground first?

PLEASE write the explanation also, thanks in advance

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