Question

HELP!!!!!
For the image on the far left, what is the total net force on the object and in which direction?

A. 2000 N upwards

B. 400 N upwards

C. 400 N downwards

Image Links: http://curriculum.kcdistancelearning.com/courses/PHYSCIx-FN-A09/a/exams/EM-UnitExam/PSAFDN_Unit5_Exam_77q.jpg

Answer 1

Add the vectors up...since it's one-dimensional, treat upwards as if it were positive, and downwards as if it were negative...so:\[(\color{red}+1200 \text{ N})+(\color{red}-800 \text{ N})=\cdots\]