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Math Help - Physics Problem

  1. #1
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    Physics Problem

    A truck falls off a cliff. If the cliff is 33.5 m high, how much time for the truck to reach the bottom?

    Displacement = -33.5m
    Acceleration = 9.8 m/s^2
    t = ?
    I can't use any of my equations because I need at least 2 known variables
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  2. #2
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    Quote Originally Posted by Honorable24 View Post
    A truck falls off a cliff. If the cliff is 33.5 m high, how much time for the truck to reach the bottom?

    Displacement = -33.5m
    Acceleration = 9.8 m/s^2
    t = ?
    I can't use any of my equations because I need at least 2 known variables
    Remember at the instant when the truck falls off the cliff its inital velocity in the y direction is v_{y}=0.

    Now you know both the intial velocity and the acceleration.
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  3. #3
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    should I make the acceleration a negative number because I keep getting a negative number that doesn't make sense?
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  4. #4
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    Quote Originally Posted by Honorable24 View Post
    should I make the acceleration a negative number because I keep getting a negative number that doesn't make sense?

    Just make sure to draw a sketch and make sure that your coordinate system is oriented correctly. Remember the signs come from how you set up the coordinates.
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