Extreme-sports enthusiasts have been known to jump off the top of El Capitan, a sheer granite cliff of height 910 m
in Yosemite National Park. Assume a jumper runs horizontally off the top of El Capitan with speed 4.0 m/s
and enjoys a free fall until she is h
= 160 m
above the valley floor, at which time she opens her parachute. How long is the jumper in free fall? Ignore air resistance.
