To study the performance of a race car, a high-speed camera is positioned at point a. the camera is mounted on a mechanism which permits it to record the motion of the car as the car travels on straightaway bc. it took 0.5 s for the car to travel from the position θ = 60° to the position θ = 35°. knowing that b = 25 m, determine the average speed of the car during the 0.5-s interval.

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

b. a lightning bug, plug of grass, and a worm

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures