Um bloco de massa 3,0 kg é abandonado com velocidade inicial nula no ponto A de um plano inclinado com atrito, como mostra a figura. O bloco atinge o ponto B com uma velocidade de 10 m/s. Supondo que a força de atrito exercida pelo plano inclinado sobre o bloco tenha sido constante e que , calcule: a) o módulo da aceleração do bloco durante a descida;
b) o módulo da força de atrito exercida sobre o bloco;
c) o módulo da força exercida pelo plano inclinado sobre o bloco.
Considere .

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

there are no atoms

just copy what u wrote and paste and search in google