The stopping distance D of a car after the brakes are applied varies directly as the square of the speed R if a car traveling 40 mph can stop and 90 feet how many feet will it take the same car to stop when it is traveling 90 mph

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?