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Math Help - Can you verify my Physics work please?

  1. #1
    Senior Member sakonpure6's Avatar
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    Can you verify my Physics work please?

    I am preparing for a physics test and i want to make sure what and how I am solving the review questions is correct because I have no answer key!Thank you in advance!

    2-You are driving in your car at a steady 80.0km/h. and you suddenly see a stop sign. You apply your breakes and stop after 60.0m(or 0.06km).

    a)How long did it take you to stop?
    What I did was find Vavg=0.5(80.0km/h + 0.0km/h) then using it in the equation of delta d=Vavg.*delta t and getting an answer of 0.0015h.

    b)What was your acceleration?
    What I did was using the formula V2^2=V1^2+2a(delta d) and I solved to get a= (to appropriate sig fig) -53300km/h^2


    3-During the span of 5.0s time intercal an object begins at 5.0m/s, accelerates uniformly and ends at 20.0m/s.

    a) What is the average speed of the obect in this 5 s interval?
    What I did Vavg=0.5(20.0m/s + 5.0m/s)=12.5m/s

    b)What is the acceleration?
    What I did v2=v1+2a(t)
    20.0m/s=5.0m/s+2a(5.0s)
    a= 3.0m/s^2



    Thank you again!!
    Last edited by sakonpure6; February 23rd 2013 at 10:02 AM.
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  2. #2
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    Re: Can you verify my Physics work please?

    Yup, your answers are right. You might wanna write your first 2 answers in meters and seconds. It's more conventional.

    a=-4.11 m/s^2

    t=5.4 s
    Last edited by Cesc1; February 23rd 2013 at 03:20 PM.
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  3. #3
    Senior Member sakonpure6's Avatar
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    Re: Can you verify my Physics work please?

    Quote Originally Posted by Cesc1 View Post
    Yup, your answers are right. You might wanna write your first 2 answers in meters and seconds. It's more conventional.

    a=-4.11 m/s^2

    t=5.4 s
    I don't get what a= -4.11 m/s^2 and t= 5.4 are supposed to mean? Mind explaining them please.
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    Re: Can you verify my Physics work please?

    Quote Originally Posted by sakonpure6 View Post
    I don't get what a= -4.11 m/s^2 and t= 5.4 are supposed to mean? Mind explaining them please.
    I just converted your answers from km/h^2 to m/s^2 and from hours to seconds because it is more conventional.
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