Ariver has a steady speed of 0.500 m/s. a student swims upstream a distance of 1.00 km and swims back to the starting point. if the student can swim at a speed of 1.20 m/s in still water, how long does the trip take? compare this with the time the trip would take if the water were still.

Let's find the time to swim upstream. time = distance / speed time = 1000 m / 0.70 m/s time = 1428.6 seconds Let's find the time to swim downstream. time = distance / speed time = 1000 m / 1.70 m/s time = 588.2 seconds The total time is 2016.8 seconds which is 33.6 minutes. Let's find the time to swim 2.00 km in still water. time = distance / speed time = 2000 m / 1.20 m/s time = 1666.7 seconds The total time to swim in still water is 1666.7 seconds which is 27.8 minutes. The swimmer could complete the 2.00 km swim 5.8 minutes faster in still water.

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .