Question

what displacement must be added to a 50 cm displacement in the +x direction to give a resultant displacement of 85 cm at 25 degrees?
(i know the ans, just need to know how to get the ans)

Answer 1

Take the resultant, figure the vertical and hoizontal component of the resultant.

vertical 85sin25
horizontal 85 cos25

So the added displacement must supply
vertical 85 sin 25
horizontal 85 cos25 -50cm

use these components to get the displacement and angle.

Answer 2

Try to get.

Answer 3

I don't know it