Question

a man swim length of 100 metre in still water with speed 1.2 metre per second and return the same length with speed 0.8 metre per second what is the average speed of swim of the man and what is his net velocity ​

Answer 1

Answer:

A man swims a length of 100 m in still water with speed 1.2 m/s and returns the same

length with speed of 0.8 m/s. Wha...

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Explanation:

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Answer 2

Avg speed =36/25 m/s

Avg velocity = 0 m/s

Let distance Aman swims be x.

u (initial speed) = 1.2 m/s

initial time = x/1.2 = 10x/12 = 5x/6

v (final speed) = 0.8m/s

final time = x/1.8=10x/18 = 5x/9

Total distance traveled = x + x = 2x

Avg. speed = total distance travelled/total time taken

                    = 2x/5x+6 +5x/9

                     =  2x/25x/18

                     =36x/25x

                     = 36/25 m/s

Total displacement = 0 m (Displacement is the shortest path from initial point to final point. As initial and final point is same displacement is 0 m)

Thus avg velocity = 0 (0 divided by anything is 0

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