A 75-m m -long train begins uniform acceleration from rest. The front of the train has a speed of 18 m/s m / s when it passes a railway worker who is standing 120 m m from where the front of the train started (see the figure below). What will be the speed of the last car as it passes the worker?

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.