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Find the speed of the object after 4 seconds

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  1. Oct 30, 2016 #1
    1. The problem statement, all variables and given/known data
    An object is thrown horizontally and after 3 seconds the speed vector forms the angle pi/4 radians with the horizontal direction. FInd the speed after 4 seconds.

    2. Relevant equations
    v=gt

    3. The attempt at a solution
    As it forms the angle pi/4 radians, vx=vy, so
    v0=gt=3*10=30
    vy when t=4 is 40m
    v=sqrt(vx^2+vy^2)=50m Am I right
     
  2. jcsd
  3. Oct 31, 2016 #2

    cnh1995

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    Right.
     
  4. Oct 31, 2016 #3

    haruspex

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    Except for the units.
     
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