A68 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

213.5 kJ

Explanation:

Mechanical energy= kinetic energy + potential energy= KE+PE= 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=

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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