12. A Train Starting from Stationary position moving with uniform acceleration attains a speed of 36 km/hr in 10 minutes find its Acceleration.​

i think the answer is a, hope this is right, that would be my best guess.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.