PLS HELP! A boy drops a ball from an observation tower. The ball hits the ground in 3.0 s. What is the ball's velocity at the time of impact?

29.4 m/s

Explanation:

We find the answer by using this equation:

v2 = v1 + a * t

Let's figure out what our variables are.

v2 = ?

We don't know the final velocity, so this variable is blank

v1 = 0

In a free fall, the velocity is 0

a = 9.8 m/s

Acceleration in a free-fall is 9.8 m/s

t = 3

It took 3 seconds for the ball to hit the ground

Now we plug our values.

v2 = v1 + a * t

v2 = 0 + 9.8 * 3

v2 = 0 + 29.4

v2 = 29.4

Hope this helps! :)

It's the number of valence electrons