Answer:
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
