Answer:

B. Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.

A. A moderately fast river flows at about 5 kilometers per hour (3 miles per hour), while fast streams during the floods exceed 25 kilometers per hour (15 miles per hour). One of the easiest ways to determine the surface speed of the river is to use your GPS on your boat, like any other moving vehicle.