A 700-N girl jumps from a balloon 36.0 m above the ground, and is brought to rest (instantaneously) 4.00 m above the ground by an elastic cord attached to the balloon.
(a) Is the girl’s acceleration upward, downward or zero at this time? Explain.
(b) If the unstretched length of the cord is 25.0 m, what is the cord’s spring constant?
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