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secondary 3 | E Maths
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Need help for question 9 & 10. Answers : 9(a) : 250(v-30) divided by v(v-15)
9(b) : 0.4060 g/cm to the power of 3
10(a) : 80 divided by v hours
10(b) : 80 divided by (v-10)(v+10) hours
10(c) : Train A will take less time. It is because 80 divided by v hours is greater than 80 divided by v to the power of 2 - 100v hours since v > 0.
Date Posted: 6 years ago
Views: 303
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done
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Qn 9
Date Posted:
6 years ago
For part (b), where did 570 & 585 come from?
When you substitute 600 into the equation you got in a. 600-30= 570 and 600-15=585
Oh ok thx
done
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Qn 10
Date Posted:
6 years ago
How do you get 0.88 and 1.143 for part (c)?
Substitute v=90 into the equation that was formed for train A and B in the earlier parts
As the earlier part of the qn asked you to find an expression for the time for train A and B in terms of v
Which equation?
In qn 10 part a and b. They asked to get an expression of the time taken in terms of v
Train A time = 80/v
Train B time= 8v/ (v^2 - 10^2)
Train B time= 8v/ (v^2 - 10^2)
Oh ok thx
You are welcome
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