i need help solving question 50 please the trajectory of the bolt as seen by an

Question

i need help solving question 50 please

the trajectory of the bolt as seen by an observer fixed on the Earth. 50. A river has a steady speed of 0.500 m/s. A student swims M upstream a distance of 1.00 km and swims back to the starting point. (a) If the student can swim at a speed of 1.20 m/s in still water, how long does the trip take? (b) How much time is required in still water for the same length swim? (c) Intuitively, why does the swim take longer when there is a current? 61. A river flows with a steady speed v. A student swims upstream a distance d and then back to the starting point. The student can swim at speed c in still water

Explanation / Answer

Given,

speed = 0.500 m/s.

distance = 1.00 km

speed = 1.20 m/s in still water

the time tken for the entire trip = time for upstream +time for down stream

    time for upstream = 1000m /(1.20 m/s - 0.500 m/s)

                                   = 1000m / 0.7 m/s

                                   = 1428 s

    time for down stream = 1000m /( 1.20 m/s + 0.500 m/s)

                                   = 1000m / 1.7 m/s

                                   = 588.2 s  

        total time for thetrip = 1428 s + 588.2 s = 2016.2 s

B) time the tripwould take if the water were still water = distance / speed

                        = 2000 m /1.20 = 1666.6 s

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