1. The problem statement, all variables and given/known data A person falls on a mattress from 4 meters. The mattress does not make him bounce. Draw the speed-time graph. 2. Relevant equations Speed-time graph principles. 3. The attempt at a solution I know the first part is a linear function, where the speed increases, because of gravity. However, the moment when the person touches the mattress and thereafter, I'm not sure what happens. We have learned Hooke's law. Should it be a curved line like the left branch of a x^2 function? I think when the person touches the mattress, the mattress increases the deceleration of the person because of Hooke's law? What do you think?