Answer:
213.5 kJ
Explanation:
Mechanical energy= kinetic energy + potential energy= KE+PE=[tex]0.5mv^{2}+mgh= m(0.5v^{2}+gh)[/tex] where m is the mass of rock climber, v is the velocity, g is acceleration due to gravity and h is the height.
By substitution where 68 Kg is m, 320 m is h, 1.5 m/s is v and 9.81 is g then
Mechanical energy=[tex]68(0.5\times 1.5^{2}+9.81\times 320)=213542.1 J\approx 213.5 kJ[/tex]
