1. The problem statement, all variables and given/known data A very silly person, intent on catching pigeons on the roof of an apartment building, trips and falls a distance of 44.6 m. She lands on a metal garbage can, crushing it to a depth of 0.453 m and walks away without having been hurt. What acceleration did she experience during the collision? And also... A parachutist jumps from an airplane and freely falls y=49.1 m before opening his parachute. Thereafter, he decelerates at a=1.92 m/s2. As he reaches the ground, his speed is 2.90 m/s. How long was the parachutist in the air? My answer was 11.73 s, which was correct. The second part of the question is: At what height did the parachutist jump from his plane? This is the one I can't figure out. 2. Relevant equations s_f = s_i +v_it + 0.5at^2 3. The attempt at a solution I couldn't get anywhere with them!