A car is traveling north on the freeway. The driver pushes on the brake and the car slows down. What is true about the car's acceleration?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?

What ions are formed when hcl dissolves in water?