Why are units of measurement useful?
a) to complete the sl system
b) to make comparing amounts easier
c) to allow scientists to do experiments
d) to design better tools such as stopwatches

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal