Explain briefly how the cushion saves people falling?

The cushion is soft.This led to increase the time of impact beteeen the people and the cushion.For same change in momentum that there are lower force acting on the people when the time of impact is longer.Thus,the force acting on the people is lower,this saves the people.
NOTE:好多時4分題目都係3個point,其中一分係睇係完唔完整同表達得好唔好。4分4個piont的除非係唔使完整。
好似chem 9分的會考題6分係chem知識3分就係表達能力。
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