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@waterineyes you know this sum ?

I don't...

you know some one in open study who can help me ?

I think @sauravshakya can help you here..

i sent him a msg .. no reply :/

But he is online..
Let me try..

okay !

Which chapter is this ??

motion in a plane.

Yeah I think you will get help here..

thanks waterineyes :)

@rsadhvika do you know how to solve this ??

|dw:1344771481322:dw|

Here A and B are the vectors..
A is representing the boat and B is representing Water...

okay .. understood !

Now We have to find Resultant first..
For that we first make our figure look like parallelogram..

okay

Wait I draw the figure more clearly for you..

its okay .. i can understand :)

|dw:1344771854805:dw|

|dw:1344771963782:dw|

is that the parellelogram we need ?

Now make it look like parallelogram:
|dw:1344771989674:dw|
Getting this ??

yeah got it !

Now can you draw diagonal of the parallelogram ??

|dw:1344772085729:dw|

wrong ?

Great..
This is the resultant of A and B vector..

okay :)

what is theta here ?

You must mention the direction also..

what direction ? direction of vector ?

|dw:1344772213529:dw|

okay !

Since boat has higher velocity then boat will go in upward direction..
Getting ??

yeah ..and if lower velocity , down ?

Yeah that will depend upon velocity of water..

okay !

Have you studied about the formula:
\[Resultant (R)= \sqrt{A^2 + B^2 + 2AB \cos(\theta)}\]

yeah i have !

yeah .. how do we find theta ?

|dw:1344772636899:dw|

i don't know !

|dw:1344772698399:dw|

That is the angle between A and the resultant..
We have to locate angle between A and B..

okay !

|dw:1344772809427:dw|
Getting??
That is the angle between A and B..

yeah !

Can you find its value ??

Make a try..

180 - 60 ?

120 ?

Great..
A medal for you..

:)

Can you tell cos(120) = ??

yea .. cos (90+30)
- sin 30
- 1/2 correct ?

I wish I could give you more medals..
Yes that is very correct..
Now can you use that formula ??

okay i'll try !

There is no need to go fast..
I can wait..
Just take your time and post your answer here..

I think this site is going to be down soon..

okay .. now i can type .. some net problem i guess.. sorry for the delay .. i got square root 475 !

91.7945