Take the tour ×  Given that:    • bungee jumper weighs 700N   •
jumps off from a height of 36m   • needs to stop safely at 32m
(4m above ground)   • unstretched length of bungee cord is 25m
Whats the force required to stop the jumper (4m above ground)
First what equation do I use?  $F = ma$? But even if $a = 0$ $v$
may not equals 0 (still moving)  $W = F \Delta x$? Can I say if
$\Delta x = 0$ object is not moving? Even then, I don't know the
work ...  I tried doing:  $-32 = \frac{1}{2} (-9.8) t^2$  $t =
2.556s$  Then I'm stuck ... I know $t$ but I cant seem to use
any other equations... $v_f, v_i =0 $  share|improve this
question Think about potential energy. –  Colin K Oct 12 '12 at
12:57 add comment  2 Answers  up vote 2 down vote accepted  As
others here have pointed out, the force of the bungee cord would
vary, increasing as it is stretched.  So your question is not
well posed. If this is an actual homework problem I would guess
that you misread it and you are actually being asked to find the
force cons