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Homework Help: Just wondering is the solution right?it is a 1D kinematic problem

  1. Sep 20, 2008 #1
    Just wondering is the solution right???it is a 1D kinematic problem

    1. The problem statement, all variables and given/known data
    An elevator ascends with an upward acceleration of 1.2m/s^2. At the instant its upward speed is 2.4 m/s, a loose bolt drops from the ceiling of the elevator 2.7m from the floor. Calculate the time of flight of the bolt from ceiling to floor and the distance its has fallen relative to the elevator shaft.

    3. The attempt at a solution
    s1 = 2.4t - (1/2)gt^2

    s2 = 2.4t + (1/2)(1.2)t^2

    2.7= -2.4t + (1/2)gt^2 + 2.4t + (1/2)(1.2)t^2
    2.7 = (1/2)[9.8 + 1.2]t^2
    2.7 = 5.5t^2
    t = √(2.7/5.5) = 0.7 seconds

    s1 = 2.4(0.7) - (1/2)(9.8)(0.7)^2
    s1 = -0.724 meters

    Just wondering is the answer right or not.
  2. jcsd
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