硬物會縮短collision impact time嗎?

問： 硬物還是軟的物件能夠延長collison既impact time?
答：軟的物件能夠延長collison既impact time，例子：the front and back of a car is desidned to be collapsible, in order to spread out the time of a collision and so reduce the force on a body.

問：硬物還是軟的物件能夠有給予較好的保護
答：硬物能夠有給予較好的保護。例如：頭盔