(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A parachutist descending at a speed of 20.0 m/s loses a shoe at an altitude of 20.0 m. (Assume the positive direction is upward.) a)When does the shoe reach the ground? (seconds) b)What is the velocity of the shoe just before it hits the ground?

2. Relevant equations

i used Vf=square root(vi2 + 2ax) or Vf=squareroot(20squared+2*20*-9.81)

for t i used t =Vav/a but i don't think that's a correct equation

3. The attempt at a solution

for Vf, i got 2.76 m/s and for time i got 1.16 s

But i know the time is definitely wrong because it has to be less than 1 second since both speed and distance are 20.0

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