You throw a ball upward with an initial speed of 4.3 m/s. when it returns to your hand 0.88 s later, it has the same speed in the downward direction (assuming air resistance can be ignored). what was the average acceleration vector of the ball? express your answer using two significant figures.

The acceleration is -9.8 m/s²

Explanation:

Hi there!!

When you throw a ball upward, there is a downward acceleration that makes the ball return to your hand. This acceleration is produced by gravity.

The average acceleration is calculated as the variation of the speed over time. In this case, we know the time and the initial and final speed. Then:

acceleration = final speed - initial speed/ elapsed time

acceleration = -4.3 m/s - 4.3 m/s / 0.88 s

acceleration = -9.8 m/s²  

think its the third option