5. How do you determine the direction of the sum in 2D?​

Geometrically, we can picture a vector as a directed line segment, whose length is the magnitude of the vector and with an arrow indicating the direction. The direction of the vector is from its tail to its head. Two vectors are the same if they have the same magnitude and direction.

that would be b i just took the test : )

f=ma newton

f=100x2.5=250n