Dados los componentes rectangulares de un vector encontrar el vector resultante si las componentes son F1= 350N y F2= 545N AYÚDENME​

positive reinforcement? ?

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me