Posted by Brooke on Monday, October 24, 2011 at 8:21pm.
You just need to calculate Jane's kinectic energy before she grabs the vine (.5mv^2). This will be equal to her gravitational potential energy (mg*height) at the top of her swing.
.5mv^2=mgh
-cancel the mass on both sides
.5v^2=gh
19.22=9.8h
h=1.96
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