# Higher Order DerivativesWatch

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#1
I hve this question below i don't know whether i should differenciate the cost and somehow use a suvat eqution to to multiply the final answer but it didn't work
I'll post the question below Question 12)
Thanks for any help
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#2 Question 12 bottom right
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1 week ago
#3
(Original post by A0W0N)
I hve this question below i don't know whether i should differenciate the cost and somehow use a suvat eqution to to multiply the final answer but it didn't work
I'll post the question below Question 12)
Thanks for any help
The total cost will be
cost per hour * time
So form the total cost in terms of "v" and differentiate to find the minimum value
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#4
(Original post by mqb2766)
The total cost will be
cost per hour * time
So form the total cost in terms of "v" and differentiate to find the minimum value
my problem is finding the time as i only know it's traveling at a constant speed and travel that its 100km
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1 week ago
#5
(Original post by A0W0N)
my problem is finding the time as i only know it's traveling at a constant speed and travel that its 100km
t = 100 / v
???
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#6
(Original post by mqb2766)
t = 100 / v
???
so for every value of v should i put 100^-1
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1 week ago
#7
(Original post by A0W0N)
so for every value of v should i put 100^-1
No. "v" is the variable that needs to be determined by differentiation. You can't stick a value in. Use t = 100/v in the expression for total cost in post 3.
Last edited by mqb2766; 1 week ago
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#8
(Original post by mqb2766)
No. "v" is the variable that needs to be determined by differentiation. You can't stick a value in. Use t = 100/v in the expression for total cost in post 3. is that what I do because the answer is £2052
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1 week ago
#9
(Original post by A0W0N) is that what I do because the answer is £2052
Don't understand that at all
* Write down the total cost in terms of v
* Differentiate it
* Set equal to zero and solve.
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