The innerspring mattress on your grandmother’s bed is held up by 36 vertical springs, each having a spring constant of 5000 n/m. a 45 kg person jumps from a 1.94 m platform onto the innersprings. the acceleration of gravity is 9.8 m/s². assume: the springs were initially unstretched and that they stretch equally (typical old fashioned bed). determine the stretch of each of the springs.