Need help getting started

  1. this here is the problem....

    Use the equations below. (Note that the direction is indicated by the sign in front of the equations.)
    x = (0.0553 m) cos(4.094t + 0.14π)

    v = −(0.226 m/s) sin(4.094t + 0.14π)

    a = −(0.927 m/s2) cos(4.094t + 0.14π)

    (a) Determine the first time (t > 0) that the position is at its maximum (positive) value.
    s

    (b) Determine the first time (t > 0) that the velocity is at its maximum (positive) value.
    s

    i have no idea where to start, or how to do this.
     
  2. jcsd
  3. Position is given by x.

    At what angle is the cos(...) maximum?
     
  4. they didnt give an angle. but I'm guessing since we want x to equal what ever number is there, then cos must equal 1 right?
     
  5. so (0.0553 m) cos(4.094t + 0.14π) is max when cos(4.094t + 0.14π) = 1

    that is when (4.094t + 0.14π) = ....?
     
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