Question

A 68 kg rock climbers 320 m above the ground the sun is down or up at 1.5 m/s using the ground as a reference point determine the total mechanical energy of

Answer 1

Answer:

213.5 kJ

Explanation:

Mechanical energy= kinetic energy + potential energy= KE+PE=$0.5mv^{2}+mgh= m(0.5v^{2}+gh)$ 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=$68(0.5\times 1.5^{2}+9.81\times 320)=213542.1 J\approx 213.5 kJ$