Question

Determine the resultant if a person walks 9 km south then 12 km west.

Answer 1

Use the Pythagorean theorem. :D

Let 9km= a
12 km= b
resultant= c

\[a^2+b^2= c^2\]

Soooo:
\[c^2=a^2+ b^2\]
\[c= \sqrt{a^2+ b^2}\]
Substitute:
\[Resultant= \sqrt{9^2 + 12^2}\]
\[Resultant= \sqrt{81+144}\]
\[Resultant= \sqrt{225}\]
Resultant = 15 km

Answer 2

Put numbers in here:
http://hyperphysics.phy-astr.gsu.edu/hbase/vect.html#vec5

Answer 3

thanks ^^ practically, this is a very easy question :))

Answer 4

Duuuuh~~ :P