A stunt performer steps off a platform from rest and falls vertically through 3.2 m onto a crash mat. Air resistance is negligible. Use g=10 N/kgg=10\ \mathrm{N/kg}g=10 N/kg.
What is the performer's speed just before reaching the crash mat?
64 m/s64\ \mathrm{m/s}64 m/s
8.0 m/s8.0\ \mathrm{m/s}8.0 m/s
5.7 m/s5.7\ \mathrm{m/s}5.7 m/s
4.0 m/s4.0\ \mathrm{m/s}4.0 m/s