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AS Further Maths Check answers (and maybe help if wrong)

Hi I was looking for some help to check my answers to some questions

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Original post by UserName734
Hi I was looking for some help to check my answers to some questions

ok I will help and are gay
Picture1.jpg
Original post by UserName734
Picture1.jpg

For part A I got v= root(5gH)
for part B I wasn't sure but got v=root(1/2root(5gH)+gh)
you got it right
Original post by JordanGracia
you got it right

part b too?
Original post by UserName734
part b too?

yes
Original post by JordanGracia
and you gay or no

what does that have to do with anything?
IDK
Reply 9
Avatar for mqb2766
mqb2766
21
Original post by UserName734
what does that have to do with anything?

Just ignore/report them. For a) *** it may be right - doing it in my head. What did you do.
(edited 2 years ago)
ok
Original post by mqb2766
Just rignore/eport them. For a) I don;t think its right. What did you do.

Thanks Have done, I will upload a picture of my working
kk
Original post by UserName734
Thanks Have done, I will upload a picture of my working

Do, but you're correct - was doing it in my head.
(edited 2 years ago)
good
Original post by UserName734
Picture2.jpg

Yup, I'd probalby have said
Initial KE = Final KE + GPE + Work done
To be clear about the signs as that would the be conservation of energy equation, but a) is right.

Checking b) now.
(edited 2 years ago)
ok
Original post by UserName734
Picture2.jpg


For b) What is your conservation of energy equation in terms of initial / final KE, GPE, workdone? Smilar to part A.
(edited 2 years ago)
Original post by mqb2766
For b) What is your conservation of energy equation in terms of initial / final KE, GPE, workdone? Smilar to part A.

intital EK + initial Ep - work done (air resistance) = final Ek
Original post by UserName734
intital EK + initial Ep - work done (air resistance) = final Ek

I'd always do it in terms of constant (conservation) of energy.
Final KE + workdone = Initial KE + GPE
GPE is measured relative to the floor and the work done is positive moving downwards. So
Final KE = Initial KE + GPE - workdone
where each of these terms should be positive. What do you get if you do that?
(edited 2 years ago)

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