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physics

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A bungee jumper falls for 1.3 seconds before the bungee cord begins to stretch. Until the jumper has bounced back up to this level, the bungee causes the jumper to have an acceleration upward of 4 m/s2.
a. How fast is the jumper going when the bungee cord begins to stretch? (HINT: this is free fall.)
b. How far below the diving platform is the jumper at that moment?
c. How long after the bungee cord begins to stretch does the jumper reach the
low point of the drop? HINT: The acceleration is different now, in both size
and direction.
d. How far below the diving platform is the jumper at the instant that the speed is zero?

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