3-1.Vectors
normal

એક હોડી $8 \,km/hr$ ની ઝડપથી નદીને પાર કરે છે.હોડીનો પરિણામી વેગ $10\, km/hr$ નો હોય,તો નદીનો વેગ કેટલા.......$km/hr$ હશે?

A

$10 $

B

$8$

C

$6 $

D

$4$

Solution

(c) Given $\overrightarrow {AB} = $  Velocity of boat = $8 \,km/hr$ 

 $\overrightarrow {AC} = $ Resultant velocity of boat $= 10 \,km/hr$

$\overrightarrow {BC} = $ Velocity of river $ = \sqrt {A{C^2} – A{B^2}} $

$ = \sqrt {{{(10)}^2} – {{(8)}^2}} = 6\;km/hr$

Standard 11
Physics

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