Atennis ball machine serves a ball vertically into the air from a height of two feet, with an initial speed of 120 feet per second. after how many seconds does the ball attain its maximum height? round to the nearest whole foot

After 3.73 seconds ball will achieve the maximum height.

Step-by-step explanation:

Initial speed of the tennis ball is u = 120 feet per second

Since at the maximum height ball's final speed will be = 0

So we will apply the formula of motion against gravitational pull

v = u - gt

Where v = speed of the ball at maximum height

u = initial speed

g = gravitational pull = 32.17 ft/sec²

t = time to achieve maximum height

Here v = 0 so

0 = 120 - (32.17)t

t = 120/32.17 = 3.73 seconds