If you do this question for me you'll get 100 points! A room worker was dropped from the roof of a building in free fall. find the following:
1- The velocity of the stone after a time of 5 s.
2- The displacement of the stone within (s 5).
Take the acceleration of free fall g = 9.8 m/s2

#1

Final velocity=v

#2

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

answer: i think it is (1,-2)