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Suppose the position of an object is given by a vector

  1. Jun 5, 2017 #1
    1. The problem statement, all variables and given/known data
    Suppose the position of an object is given by r⃗ = (3.0t2i^ - 6.0t3j^)m. Where t in seconds.

    Determine r⃗ at time t = 2.5 s. Express your answer using two significant figures. Express your answer in terms of the unit vectors i^ and j^.

    2. Relevant equations
    plugging in 2.5 seconds to the r equation

    3. The attempt at a solution
    r = 3(2.5)^2i-6(2.5)^3j -> 18.75i-73.002j -> 19i-73j

    When I put this answer in my homework, it says it's wrong. I even tried (19i-73j) and it says it's wrong.
     
  2. jcsd
  3. Jun 5, 2017 #2

    haruspex

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    Yes.
    No.
     
  4. Jun 6, 2017 #3
    oh what. nvm. that was so weird. thank u so much!
     
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