physics
posted by july on .
vector (V1) is 6.3 units long and points along the negative (X) axis. Vector(V2) is 9.0 units long and points at 55 degree to the positive (X)axis.
1 What are the (X) and (Y) components of (V1) vector ?
2What are the (X) and (Y) components of(V2) vector ?
3Determine the magnitude of the sum (V1+V2).
4Determine the angle of the sum (V1+V2).
i've got the answers of the first three questions
1 6.3,0
2 5.2,7.4 units
3 7.5 units
i tried putting tan1 y/x
fot the 4th question but i've got the wrong answer
i need a help

I do not agree with your answer to #3, either.
V2 components are (5.16, 7.37)
V1 + V2 has components (11.46,7.37)
V1 + V2 has magnitude = 13.63
Angle of V1 + V2 = tan1 y/x
= 32.7 degrees
counterclockwise from the +x axis.