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what is the reason behing taking downstream as x+y and upstream as x-y?? please give me the reason clearly expert!

Asked by my3shyll 9th May 2016, 10:14 PM
Answered by Expert
Answer:
W a t e r space i n space a n y space p o n d space o r space l a k e space i s space s tan d i n g space w a t e r space o r space s t i l l space w a t e r.
S o space t h e space s p p e d space o f space t h e space w a t e r space i n space p o n d space i s space z e r o space i n space s tan d i n g space w a t e r.

N o w space o b s e r v e space a n y space r i v e r space o r space s t r e a m
I n space r i v e comma space w a t e r space i s space r u n n i n g space w a t e r space a n d space h e n c e space t h e r e space i s space s o m e space s p e e d space i n space t h e space r u n n i n g space w a t e r.

N o w space a s s u m e space t h a t comma space y o u space a r e space c l i m b i n g space u p space i n space a space h i l l space t h r o u g h space c y c l e.
T h e n space y o u space n e e d space t o space g i v e space m o r e space e f f o r t s space o f space p e d a l l i n g space a n d space i t space w i l l space t a k e space m o r e space t i m e space t o space r e a c h space t h e space p e a k.

S u p p o s e space y o u space a r e space c o m i n g space d o w n space t h r o u g h space t h e space v a l l e y comma space y o u space c a n space p e d a l space t h e space c y c l e space e f f o r t l e s s l y space t o space r e a c h space t h e space t a r g e t.

H e r e space a l s o space t h e space s a m e space c o n c e p t space a p p l i e s.
U p s t r e a m space m e a n s comma space t h e space b o a t space i s space m o v i n g space a g a i n s t space t h e space s t r e a m comma space t h a t space i s space i n space t h e space d i r e c t i o n space o p p o s i t e space t o space t h a t space o f space t h e space s t r e a m.
T h e r e f o r e comma space w e space n e e d space m o r e space e f f o r t space t o space g o space i n space t h e space u p s t r e a m.
H e n c e space t h e space s p e e d space o f space t h e space b o a t space i s space r e d u c e d space t h e space s p p e d space o f space t h e space s t r e a m.
T h u s comma space t h e space s p e e d space o f space t h e space b o a t space i s space x space minus space y space k m divided by h comma space w h e r e space x space i s space t h e space s p e e d space o f space t h e space b o a t space i n space s t i l l space w a t e r comma space a n d space y space i s space t h e
s p e e d space o f space t h e space s t r e a m.

D o w n s t r e a m space m e a n s comma space t h e space b o a t space i s space m o v e s space w i t h space t h e space s t r e a m comma space t h a t space i s space i n space t h e space d i r e c t i o n space o f space t h e space s t r e a m.
T h e r e f o r e comma space w e space n e e d space l e s s space e f f o r t space t o space g o space i n space t h e space d o w n s t r e a m.
H e n c e space t h e space s p e e d space o f space t h e space b o a t space i s space i n c r e a s e d space b y space t h e space s p p e d space o f space t h e space s t r e a m.
T h u s comma space t h e space s p e e d space o f space t h e space b o a t space i s space x space plus space y space k m divided by h comma space w h e r e space x space i s space t h e space s p e e d space o f space t h e space b o a t space i n space s t i l l space w a t e r comma space a n d space y space i s space t h e
s p e e d space o f space t h e space s t r e a m.
Answered by Expert 10th May 2016, 9:54 AM
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