Mathematics: Post your doubts here!

[Browny]

Yeah.

 

[Browny]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_43.pdf

Can anyone explain in question 5 why we write 24 as the only the answer as the solution of quadratic gives 2 values of V?

 

[Browny]

the friction BETWEEN the 2 boxes is of no use for the 1 part
apply F=ma for the whole system

Why no use?

 

[Browny]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_43.pdf

Can anyone explain in question 5 why we write 24 as the only the answer as the solution of quadratic gives 2 values of V?

 

[Browny]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_43.pdf

Can anyone explain in question 5 why we write 24 as the only the answer as the solution of quadratic gives 2 values of V?

 

[princeali97]

View attachment 42224 I have been stuck on this question PLEASE do it someone!!!

And please I need all details, pretend you're teaching a toddler

Yes a good question.Here you go.

 

[Suchal Riaz]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_43.pdf

Can anyone explain in question 5 why we write 24 as the only the answer as the solution of quadratic gives 2 values of V?

putting the second value in the expression of total distance gives wrong answer.

 

[Suchal Riaz]

Yes a good question.Here you go.

i had already answered that question but still thanks for helping

 

[Browny]

Then why does it satisfy the equation?

 

[princeali97]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_43.pdf

Can anyone explain in question 5 why we write 24 as the only the answer as the solution of quadratic gives 2 values of V?

Because u must have found the second value to be 230.77 ms-1 which is impossible for a car to have such a speed.You'll simply write (not possible) or (discard) below this value and take 24ms-1 as the answer.

 

[princeali97]

i had already answered that question but still thanks for helping

Oh ohk no probs.

 

[Suchal Riaz]

Then why does it satisfy the equation?

idk i will solve complete question after dinner and then let you know.

 

[Browny]

Because u must have found the second value to be 230.77 ms-1 which is impossible for a car to have such a speed.You'll simply write (not possible) or (discard) below this value and take 24ms-1 as the answer.

You sure right.

 

[Xerav43]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s13_qp_42.pdf
Question no.7 , (ii)
I'm having trouble finding the distance of A from P when A comes to
instantaneous rest.
Appreciate all help.

 

[Xerav43]

ok bro
can i have the answers for part 1 please??????

Here you go , tried to make it as detailed as possible.

 

[Xerav43]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s13_qp_42.pdf
Question no.7 , (ii)
I'm having trouble finding the distance of A from P when A comes to
instantaneous rest.
Appreciate all help.

Never mind i solved it lol

 

[Suchal Riaz]

Never mind i solved it lol

any other query?

 

[Xerav43]

any other query?

nope , that's it for now!

 

[$$AK$$]

Because u must have found the second value to be 230.77 ms-1 which is impossible for a car to have such a speed.You'll simply write (not possible) or (discard) below this value and take 24ms-1 as the answer.

man can u tell me how to express T2 in terms of V ??
thnx

 

[Suchal Riaz]

man can u tell me how to express T2 in terms of V ??
thnx

V/T2 = acceleration = 0.3
T2=V/0.3