Question

A set of crash tests consists of running a test car moving at a speed of 12.2 m/s (26.8 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 55.0 kg (121.0 lbs) dummy is found to move a distance of 0.690 m from the moment the car touches the wall to the tíme the car is stopped. Calculáte the size of the average force which acts on the dummy during that time The force that acts on the dummy has to do (negative) work on the dummy. It must slow the dummy and stop it. Thus the amount of work equals the kinetic energy of the dummy. From the equation of work done by a force we can calculate that orce. 2823.7 N Submit Answer Incorrect. Tries 7/8 Previous Tries Using the direction of motion as positive direction, calculate the average acceleration of the dummy during that time (in g's) (use 1g-9.8 m/s2) Submit Answer Tries 0/8 In a different car, the distance the dummy moves while being stopped is reduced from 0.690 m to 0.230 m calculate the average force on the dummy as that car stops Submit Answer Tries 0/8

Answer 1

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