Momentum will be conserved in a two-body collision   only if the kinetic energy of the system is conserved.   only if the internal forces of the two body system cancel in action-reaction pairs.   only if  the net external force acting on the two-body system is zero.   only if both bodies come to rest     How does an air mattress protect a stunt person landing on the ground after a stunt?

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Momentum will be conserved in a two-body collision

 
  1. only if the kinetic energy of the system is conserved.

     
  2. only if the internal forces of the two body system cancel in action-reaction pairs.

     
  3. only if  the net external force acting on the two-body system is zero.

     
  4. only if both bodies come to rest

     

     

    How does an air mattress protect a stunt person landing on the ground after a stunt?

     
    1.  It reduces the momentum change of the stunt person

       
    2. It lengthens the stopping time of the stunt person and reduces the force applied during the landing.

       
    3. It shortens the stopping time of the stunt person and increases the force applied during the landing

       
    4.  It reduces the kinetic energy loss of the stunt person

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