the answer to your question is 10.5 kJ
Answer:0.246 m
Explanation:
Given
height of window (h)=1 m
Time to pass window =0.28 s
Let roof is at a distance of
above window
let t be the time to cover 
------1
--------2
subtract 1 & 2

![1=\frac{g}{2}\left [ \left ( 2t+0.28\right )\left ( 0.28\right )\right ]](https://tex.z-dn.net/?f=1%3D%5Cfrac%7Bg%7D%7B2%7D%5Cleft%20%5B%20%5Cleft%20%28%202t%2B0.28%5Cright%20%29%5Cleft%20%28%200.28%5Cright%20%29%5Cright%20%5D)
t=0.224 s


I believe the answer is purple
He turned his observations into laws, to establish constants and explanations of future scientists.