Physics Questions about vectors. Someone help me please? The given vectors are at the top of the image.?

Steve4Physics

If you don’t know the basics of adding vectors, watch the video in the link first. Then the answers should make sense. You may need pencil/paper to make the necessary sketches. They have used the same letters for the 3 given vectors at the top and also for the answer-choices. This is potentially confusing. So I’ll call the 3 vectors at the top A’, B’ and C’. _________ Q9. We want 2B’. Since 2B’ is a vector with the same direction as B’ but twice as long, Look through the choices - it must be C. _________ Q10. We want A’ - B’. This is the same as adding A’ and -B’. So imagine B’ reversed and add it to A' by the tip-to-tail method (see link). Answer B. _________ Q11. We want B’ + C’. Add by the tip-to-tail method (see link). Answer B. _________ Q12. We want A’ - B’ - C’. There are 3 different ways: a) Take the answer from Q10 and subtract C’. Or... b) Since A’ - B’ - C’ = A’ - (B’ + C’) subtract the answer from Q11 from A’. Or... c) Reverse B’ and C’ to get -B' and -C'.. Then add A’ + (-B’) + (-C’) using the tip-to-tail method. Answer A.

Old Science Guy

... need a clearer picture I have enlarged it several times but details like the arrow pointer tend to disppear When you get a good response, please consider giving a best answer. This is the only reward we get.