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Class : X
Ch : 4
Pg : 87,
Example : 15
Why we take Upstream as (18-x)km/h and not (x-18)km/h, and same for downstream??
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kunjal75:
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Kanika
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are you in which std
I've wrote it in my bio
Answers
Answered by
6
dear we take upstream as negative beacuse it is opposite to the gravity of the earth and we take positive to downstream because it's with gravity of the earth
nono.. why not (x-18) ??
as speed of upstream
Answered by
0
because when you are going downstream , you are going in the direction of the river so the values of your speed will add up and it will be (18+x) and in upstream, you are going in the direction opposite to the river
So the values of speed will subtract as they are contradicting each other.
Hope it helps!^_^
Mark my answer as brainliest!!
No.. why speed is not taken (x-18)km/h but (18-x)km/h??
because the value of x is smaller than 18 and speed cannot be negative^_^
if you are solving with x - 18 you will probably get a negative or unreal answer
and you will get to know that it would be 18-x
But..
Isnt there some another way of knowing that rather than solving wrong first and then the right ons
one*
no sorry but usually its no. ± x
hey so mark my answer as brainliest
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