force = change of momentum/change of time
change of momentum = -61 * 11.6 = - 708 kg m/s
time:
moved .69 meters at average speed of 11.6/2
so .69/5.8 = .119 second
so
force = -(708 kg m/s) / .119 s
= 5948 kg m/s^2 or Newtons
A set of crash tests consists of running a test car moving at a speed of 11.6 m/s (25.52 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 61 kg (134.2 lbs) dummy is found to move a distance of 0.69 m from the moment the car touches the wall to the time the car is stopped. Calculate the size of the average force which acts on the dummy during that time.
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