3. A car going south 35 mi/hr speeds up when the speed limit changes. It takes 0.05 hours to
accelerate at a rate of 200 mi/hr? What is the
car's final velocity?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.