Please help!! The graph in the figure shows the position of a particle as it travels along the x-axis. What is the magnitude of the average speed of the particle between t = 1.0 s and t = 4.0 s?

C = 0.67

Explanation:

Average velocity = the change in x over the change in time.

The change in x here is x(4) - x(1) which is simply 2-0 = 2.

The change in time is 4 - 1  = 3.

Since Average velocity is change in x over change in time, it equals 2/3 = 0.67

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