What is the acceleration of a projectile when its instantaneous vertical velocity is zero at the top of its tr

Question

tnx..

Answer 1

9.8 m/s^2

Gravity is always pulling on it and is the same whether the object is standing still, moving up or moving down. You would need another force acting on it change the acceleration.

Answer 2

to build on Mophistos answer you must mention it is 9.8 m/s^2 DOWNWARDS because velocity is a vector. other way to write it is -9.8 m/s^2 if you have established the y-axis in way where down is negative and up is positive.

Answer 3

To add to AosM, the acceleration is also a vector pointing downwards!  Also, to add to Captain Mephisto, the 9.8 value is for sea level (more or less) on earth.  It would be about 1.6 on the moon, for example.