According to the graph, what is the instantaneous speed of the object at 5 seconds? * Captionless Image
4 m/s
7 m/s
0.25 m/s
3 m/s

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.