Question 52 1 pts When designing a helmet, where would you want to place the center of mass of the helmet? O At the center of mass of the head O Anterior to the center of mass of the head O Posterior to the center of mass of the head Question 53 1 pts The acromioclavicular joint is a which allows O Planar (gliding) ; upward-downward rotation O Saddle ; elevation-depression O Planar (gliding) ; protraction-retraction O Saddle ; upward-downward rotation OL