Agnat takes off from one end of a pencil and flies around erratically for 18.6 seconds before landing on the other end of the same pencil. if the gnat flew a total distance of 7.15 meters, and the pencil is 6.13 cm long, find the gnat's average speed, as well as the magnitude of the gnat's average velocity vector.

Explanation:

Total distance traveled = 7.15 m and time = 18.6 s

average speed = 7.15/18.6 =0. 3844 m/ s = 38.44 cm /s

Total displacement = 6.13 cm , time = 18.6 s

Average velocity = 6.13/18.6 =0  .3295 cm/s = 3.295 mm /s.

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