Betsy drives at 10 m/s on an entrance ramp and enters a highway where she increases her speed to 24 m/s in only 3 seconds. what was betsy's acceleration?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.