Question

what is the acceleration of a projectile at the top of the trajectory
​

Answer 1

${\mathtt{\huge{\red{\underline{Hey \: Mate \: !!}}}}}$

☞So the acceleration of the projectile is equal to the acceleration due to gravity, 9.81 meters/second/second, from just after its thrown, through its highest point, and until just before it hits the ground..........ツ

Answer 2

$\huge\boxed{\displaystyle \rm\orange{Answer}}$

The acceleration of the projectile is equal to the acceleration due to gravity, 9.81 meters/second/second, from just after its thrown, through its highest point, and until just before it hits the ground.