Scientific laws describe natural relationships that have been tested repeatedly and are generally accepted as universal and true. which of the following describes a scientific theory?

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Which accurately compares concave and convex lenses?