Use the magnitude and direction of the force that Maggie is using to pull the sled to write the force incomponent form as .

Angle is the direction angle that makes with the positive - axis.

So, .

Component form of a vector is .

.

Since Maggies brother is pushing the sled to the left, the component form of his force is .

Add the algebraic vectors representing and to find the resultant force, vector .

.

Find the magnitude of the resultant vector .

Find the resultant direction angle .

Since the resultanr vector in quadrant II, .

.

Therefore, the resultant force on the sled is about at an angle of about with the horizontal. 

The resultant force on the sled is about at an angle of about with the horizontal.