During a science experiment, your teacher drops a tennis ball out of a window. the ball hits the ground 3 seconds later. (a) what was the ball's speed when it hit the ground? ignore air resistance. (b) what was the ball's average speed during the 3 seconds? (c) how high was the window?

a)29.43 m/s

b)14.72 m/s

c)44.15 m

Explanation:

For this question, apply free Fall formula

Given that a ball was dropped from a window and it took 3 seconds to hit ground, then;

a) speed of ball when it hit ground was;

v=gt where g is acceleration due to gravity and t is time the ball took to hit the ground

v =9.81 × 3= 29.43 m/s

b) Average speed = (initial velocity + final velocity)/2

Initial velocity =0m/s

Final velocity in 3 seconds= 29.43 m/s

Average speed = (0 +29.43)/2 =14.72 m/s

c) Height of window  is given by h=1/2 gt²

t=3s

g=9.81 m/s²

h=1/2×9.81×3² =44.15 m

50 inches should be the resultant vector