Why does heat transfer in metal faster than it will in air

The two required components for a generator are

Amass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. initially, the mass is released from rest from a point 8 inches below the equilibrium position. find the equation of motion. (use g = 32 ft/s2 for the acceleration due to gravity.)

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?