1. Vector Ä has magnitude of Sunits and makes an angle of 45° with the positive x-axis. Vector B also has the same magnitude of Sunits and directed along the negative x-axis. Find a. The magnitude and direction of A + B​

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

answercollision;