Provide clear explanations of how you solve it please. It's physics 211

EXERCISE 2: BUNGEE JUMPING Imagine a bungee jumper stepping out of a platform initially with kinetic zero energy. Let us take the system to be the bungee jumper, the bungee cord and the Earth and let us assume that the thermal energy of the system do not change during the jump. MODEL: We can treat the bungee jumper as a particle. . The bungee cord is a perfect spring of zero mass, spring constant k and unstretched length d (when the bungee cord is taut but has not yet begun to stretch, the bungee jumper is d below the platform). . The system is taken to be the bungee jumper, the bungee cord and the Earth. The coordinate system has y pointing up and the ground is taken to be y = 0. The platform is at height h. Drag is negligible VISUALIZE: Let's first do an energy bar diagram 2. Draw the energy bar charts at each of the four moments represented below. If an energy is zero, write "0" on the zero line. Platform Bungee cord (k) h! - . ..............." y Ground y=0 Just before stepping Bungee cord at Bungee cord Bungee cord at off platform unstretched length partially stretched maximum stretch K+ Ug + Us K + Ug + Us = K + Ug + Us = K + Ug + Us . ..- - - . . . - - - - .... . ... - . . . ..... ..... ..... PHYS 211 RECITATION Check with you instructor! 3. You have a bit of a debate with friends about when you begin to slow down: as soon as the bungee cord "kicks in" (starts pulling on you) or sometime later in your fall. Using free-body diagrams and Newton's Second Law, construct an argument to answer this question. Argument here: 4. a) Write an expression for the stretching Ay of the cord in terms of h, d and y. b) Write expressions for the total potential energy U of the system in terms of h, d, y, k, m and g. before and after the bungee cord "kick in"