A car is driving at 25 m/s when the driver sees a sign indicating the speed limit has dropped to 15 m/s. It takes the car 4 seconds to slow down to the correct
speed. What was the car's acceleration?
Your answer

What do the atoms of elements in the same group have in common? a. they have the same atomic numbers. b. they have the same average atomic masses. c. they have the same number of electron shells. d. they have the same number of electrons in their outermost shells.