You should not look at a screen for more than an hour.
1.It coulkd ruin your eyes
2.You could read..A screen is not helping your brain
3 You need use your brain! Go outside read a book study or something!
Yes it is because no one knows and you don't expect to get the answer.
Distance is how much you traveled from begin to end so if you traveled along a road that was 500 m twice then your distance is 1000 m
displacement is change in position between your starting and ending points and since you started and ended at the same place then your displacement is 0<span />
C is the only one that makes sense
it's not A because he has no eyes
it's not B because most of his knees aren't even there
it's not D because there is no ball
I believe C is the answer
Hope this helps