- Introduction -
Example: An apple was dropped and its average falling speed was determined.Notice that the measurements in this example are given with only one significant digit of accuracy. The result of the calculation is therefore a rough approximation. Reporting measurements to three significant digits of accuracy gives a much more useful result. A more careful measurement might give; h=5.37ft and t=0.347sec. The average speed would then be calculated to be 15.5 ft/sec. To measure changing speed, multiple measurements must be made. In this case, a table is helpful for keeping order.
Height of drop (h) = 6 feet
Time for drop (t) = 0.5 seconds
The average speed of the apple = distance/time = h/t = 6 ft/0.5 sec = 12 ft/sec