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physics question guys? help needed? SUVAT?

Discussion in 'General Discussion' started by aaron, 15 Oct 2009.

  1. aaron

    Wise Guy

    Joined: 20 Nov 2008

    Posts: 1,037

    hey guys just wondering if you could give me a bit of help as im totally lost :confused:

    Right basically ive done the majority of the question but i now need to work out acceleration but no matter what i do i cant rearange the equation to give me acceleration as the subject without it coming out wrong.

    S=100 M
    U=10 M/s
    V=4 M/s
    A=?
    T=14.3 s

    basically im currently trying to use the V=U+AT equation, dont know if im missing a step here or any thing.

    The answers meant to be -0.42 M/s ohhh and btw it is meant to be decceleration if you were wondering about the initial and final velocity.

    Any help would be apreciated :D
    cheers.
     
  2. Tefal

    Capo Crimine

    Joined: 30 Jun 2007

    Posts: 66,594

    Location: Wales

    V-U/T=A
     
  3. aaron

    Wise Guy

    Joined: 20 Nov 2008

    Posts: 1,037

    no cause that yields an answer of 3.3 and the answers supposedly -0.42, thanks anyway hehe
     
  4. Alex74

    Mobster

    Joined: 7 May 2009

    Posts: 3,541

    Location: London

    Just to avoid confusion..:)


    EDIT: In above post maybe you didnt subtract first before dividing?
     
  5. bloodiedathame

    Sgarrista

    Joined: 11 May 2007

    Posts: 8,012

    Location: Surrey

    4 - 10 = -6
    -6 / 14.3 = -0.419
     
  6. Tefal

    Capo Crimine

    Joined: 30 Jun 2007

    Posts: 66,594

    Location: Wales

    no that yeilds a -0.419580

    v-u = -6

    -6/14.3= -0.4195804195804196

    :)
     
  7. Col_M

    Mobster

    Joined: 17 Jan 2005

    Posts: 3,751

    Location: London

    V=U+AT
    V-U=AT
    (V-U)/T=A
    (4-10)/14.3 = -0.42
     
  8. diverse180

    Wise Guy

    Joined: 7 Nov 2008

    Posts: 1,507

    W-T=F

    :)
     
  9. aaron

    Wise Guy

    Joined: 20 Nov 2008

    Posts: 1,037

    thanks alex much apreciated :p cheers bud. I hate SUVAT hehe
     
  10. aaron

    Wise Guy

    Joined: 20 Nov 2008

    Posts: 1,037

    thanks guys
     
  11. Tefal

    Capo Crimine

    Joined: 30 Jun 2007

    Posts: 66,594

    Location: Wales

    Bah I'm slovenly :mad::p (yes my physics teacher used to tell me off for missing brackets out too :()
     
  12. Tefal

    Capo Crimine

    Joined: 30 Jun 2007

    Posts: 66,594

    Location: Wales

    why you thanking alex i gave you the damn answer and you said it was wrong.

    bah thought any gcse student would have figured it out without the need for brackets.
     
  13. LeJosh

    Capodecina

    Joined: 24 Sep 2008

    Posts: 10,434

    Location: Edinburgh.

    There, there. /hug

    It's ok. ;)
     
  14. Tefal

    Capo Crimine

    Joined: 30 Jun 2007

    Posts: 66,594

    Location: Wales

    ungrateful gits :p

    *rubs LeJosh*

    he's just plugging it in the damn calculator without understanding and taking what it gives him as gospel :p
     
  15. aaron

    Wise Guy

    Joined: 20 Nov 2008

    Posts: 1,037

    aww guys all your helps apreciated...hugs for alll lmao, im just upset because my earphones just broke and they were awesome lol.

    ohh and i do apologise Tefal, and yes i was just plugging into a calculator without thinking it through hehe sorry. im rather tired mind you lol