Question 1. Select the best answer regarding your observation from step 1.9. a. both s and b appear as identical sine waves. b. both s and b have the same amplitudes but different frequencies. c. both s and b appear as identical cosine waves. d. both amplitudes and frequencies are equal.

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?