A 15.0-kilogram object is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the object to increase its speed to 11.5 meters per second? A. 422 J
B. 570 J
C. 120 J
D. 992 J

(Someone please help, I can’t move on with my exam until I answer this and I have no clue how to do it)

yo yo yo its papaguy in the house lol

okay, ima .

um it shows links to uh so kinda microsoft website is that were ima go or no? ?

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

its lower due to the doppler effect.: apex