What is the most important safety rule in science? a. never work with chemicals. b. always use unbreakable glassware. c. always follow your teacher’s instructions and textbook directions exactly. d. none of the above

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?