The concepts used to solve this problem are those related to the Pythagorean theorem for which we will calculate the distance and the pitch.
According to the attached diagram we have that the expression of the resulting displacement is

Therefore the resultant displacement of the girl is



Therefore the girl has displaced around of 5 blocks
your answer will be B . becasue light can be transformed into heat .
Yes because it helps them locate their position and direction
The ball was moving for 0.8seconds
This is because 4/5 x 1 = 0.8
Hope this helps and good luckkkk :)
1. Velocity
2. Time
3. Idk
4. Idk
5. D. I think it may be A. but I think D.