You are at your first bungee jump and, as you fall off the platform, you decide

Question

You are at your first bungee jump and, as you fall off the platform, you decide to figure out how far you're going to go before you stop. Your legs are connected to two large stretchy cords (like big rubber bands) that each have a "spring constant" of 35 N/m. If you fall 20 m before the cords start stretching, how far have you fallen (from where you start) when you stop and bounce back up Your mass is 75 kg. You pull a cart along the ground at a constant velocity, pulling upwards at 40^degree. The force of friction on the cart is 35 N. How much work do you have to do to pull the cart 200 m

Explanation / Answer

after the cord is stretched

m*g*(h+x) = 0.5*k*x^2

75*9.8*(20+x) = 0.5*35*x^2

x = 56.8

total distance = 76.8 m

+++++++++++

work done = change in KE = (1/2)*m*(v^2-u^2)

since velocity = constant = v = u

change in KE = 0

W = 0

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