A 1.5 kg block sliding on a rough horizontal surface (coefficient of friction of 0.34) is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 0.20 m horizontally from the equilibrium position and released from rest, how fast is the block moving when it passes the equilibrium position for the first time?

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.

what is the actual question though?

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

answer: 31, 5556. 952 seconds