Hi
Anyone can help in this question?
Thanks1
Can anyone help on this question
PSLE marks the graduation of Primary school students and their entry into Secondary schools as teenagers. Discuss all issues about Secondary schooling here.

bluesky63  YellowBelt
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Re: Can anyone help on this question
by bluesclue » Tue Feb 24, 2015 7:18 am
1. Find out the relationship of the figure. The distance between the boy and the heli is the hypotenuse. For right angled triangle, the 3 sides are related by sum of squares of the two short sides > …….. theorem
2. Given one side is changing at 25m/s , make this side x, and rate of change of x, dx/dt =25 m/s
3. Given another side is constant, so the 3rd side is…. y= f(x)=theorem from step 1. find dy/dx
4. Using chain differentiation, rate of change of y, dy/dt= dy/dx. dx/dt
5. post back if you still need more clues.
2. Given one side is changing at 25m/s , make this side x, and rate of change of x, dx/dt =25 m/s
3. Given another side is constant, so the 3rd side is…. y= f(x)=theorem from step 1. find dy/dx
4. Using chain differentiation, rate of change of y, dy/dt= dy/dx. dx/dt
5. post back if you still need more clues.

bluesclue  OrangeBelt
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Re: Can anyone help on this question
by bluesky63 » Tue Feb 24, 2015 12:49 pm
Hi,
Can explain more on how to form the y = f(x)? Thanks !
Can explain more on how to form the y = f(x)? Thanks !

bluesky63  YellowBelt
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bluesclue  OrangeBelt
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Re: Can anyone help on this question
by bluesky63 » Tue Feb 24, 2015 3:12 pm
Hi bluesclue,
what is the x value to sub in dy/dx ? thanks
what is the x value to sub in dy/dx ? thanks

bluesky63  YellowBelt
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Re: Can anyone help on this question
by pinkapple » Thu Feb 26, 2015 4:13 pm
bluesky63 wrote:Hi bluesclue,
what is the x value to sub in dy/dx ? thanks
X is the horizontal distance so x = 72 add required by question

pinkapple  BlueBelt
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Re: Can anyone help on this question
by bluesky63 » Fri Feb 27, 2015 10:39 am
pinkapple wrote:bluesky63 wrote:Hi bluesclue,
what is the x value to sub in dy/dx ? thanks
X is the horizontal distance so x = 72 add required by question
Thanks a lot... Got it !

bluesky63  YellowBelt
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