Posted by **Kyra** on Monday, April 8, 2013 at 10:49pm.

Find the magnitude of the resultant vector of two 5-pound forces that act on an object with an angle of 70° between them.

- Math -
**Steve**, Tuesday, April 9, 2013 at 12:11am
let

u = (5,0)

v = (5cos70°,5sin70°)

then

u+v = (5(1+cos70°),5sin70°) = (6.71,4.70)

now just get |u+v| and its direction

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