Ablock lies on a horizontal frictionless surface and
isattached to the free end of a spring, with a spring constant of
60n/m. initially, the spring is at its relaxed length and the
blockis stationary at position x = 0. then an applied force with
aconstant magnitude of 3 n pulls the block in the positive
directionof the x axis, stretching the spring until the block
stops. assumethat the stopping point is reached. what is the
position of theblock?

0.1 m

Explanation:

F = Force exerted on spring = 3 N

k = Spring constant = 60 N/m

x = Displacement of the block

As the energy of the system is conserved we have

The position of the block is 0.1 from the initial position.

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