Question

help with vectors sum

Answer 1

I want to sum two vectores and find another one.

The first is gravitational acceleration: 9.8m/s 270º
The second is unknown but has to be horizontal

The resulting one has to have a magnitude of 3.71m/2

How to find the missing values?

Answer 2

in this specific case, your vertical and horizontal vectors form a right angle, and with the 3rd side, a right triangle

So you could use pythagoras:
a^2 + b^2 = c^2

Answer 3

use trig to find the angle... I am not sure which angle you want..

Answer 4

what about the magnitude of the horizontal component?

Answer 5

use pythagoras: a^2 + b^2 = c^2

Answer 6

you know 2 out of the 3 sides.