what is the acceleration of a projectile when it gets to the top of its trajectory?

Question

please explain?

Answer 1

A projectile at the top of it's trajectory stopped accelerating.

At this point gravity will start to take over, and it will start accelerating downward at 32 feet per second squared.

Answer 2

Since you said trajectory I am assuming that this object is in projectile motion. When in projectile motion the object is discussed in two directions ( vertical and horizontal). If the object is at its peak in projectile motion then it's vertical component reaches zero velocity but gravitational acceleration is still present pulling the object toward earth).
( The horizontal component maintains it's constant velocity and there is no gravitational acceleration in the horizontal direction)

Answer 3

NO NO NO the first 3 people are wrong! The acc of a projectile will be 9.8 m/s^2. The instantaneous velocity will be zero but since acc is defined as the rate of change of velocity it won't change otherwise how would the object go down.

Answer 4

The first three responders would increase the signal to noise in YA Physics if they refrained from answering questions here in the future. The acceleration of gravity near the surface of the earth is 9.8 m/s^2 downward. Note the period at the end of the previous sentence.

Answer 5

At that point, it is about to fall toward ground, so has exactly lost the acceleration (9 metres per second per second?) needed to beat earths gravity.
I guess 'zero'. Tho the projectile was slowing down at that point and you might think it had negative acceleration equal to the force of gravity

Answer 6

Hai shannn,

It's ZERO!!!!

Because, the projectile continues to move up as long as there is any acceleration in it.