The value of acceleration at the highest point of a projectile's path is equal to the acceleration due to gravity, approximately 9.8 m/s², directed downward. Although the vertical component of velocity is zero at this highest point, the acceleration remains constant throughout the projectile's motion.

Explanation

• At the highest point, the vertical velocity component becomes zero, but the horizontal velocity is still present (assuming no air resistance).
• The acceleration at the highest point does not become zero; it remains constant due to gravity acting downward with a magnitude of about 9.8 m/s².
• This acceleration is responsible for changing the vertical velocity direction from upward to downward after reaching the apex.

Thus, the acceleration vector at the top of the projectile path has a magnitude of g≈9.8 m/s2g\approx 9.8,m/s^2g≈9.8m/s2 directed vertically downward.