a 60 kg daredevil physicist attaches a bungee cord with a force constant of 15.5 N/m to his waist and jumps
off a bridge that is 100 m above the water. The unstretched length of the bungee cord is 8.0 m.
a. Calculate his speed when he is half way down.
b Does he hit the water? Calculate how far he jumps.
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