An adiabatic closed system is accelerated from 0 m/s to 30 m/s. Determine the specific energy change of this system, in kJ/kg.

initial velocity, u = 0 m/s

final velocity, v = 30 m/s

Let the mass is m.

Initial kinetic energy, Ki = 1/2 mu² = 0

Final kinetic energy, Kf = 1/2 mv² = 0.5 m x 30 x 30 = 450 m

Specific energy change = change in kinetic energy per unit mass

= 450 m / m = 450 J/kg = 0.45 kJ/kg