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Homework Help: Dynamics & Inelastic Momentum

  1. Mar 20, 2013 #1
    1. The problem statement, all variables and given/known data

    In a test of a car seat belt system, a dummy of mass 55kg in a car seat is accelerated to a speed of 35m/s before it hits a brick wall. The seat belt allows the dummy to move forward relative to the seat by a distance of 0.60 m. Calculate,

    (a) The deceleration of the dummy

    (b) The force on the dummy due to the seat belt

    2. Relevant equations


    3. The attempt at a solution
    I thought of using simultaneous equation to solve this. When I substituted the values to the equation F=ma, I realised F is an unknown. Then, time is also an unknown.
    Last edited: Mar 20, 2013
  2. jcsd
  3. Mar 20, 2013 #2
    Hello dio11

    If you assume that the acceleration is constant, then part (a) is a simple one-dimensional kinematics problem.
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