The speed of a train increases from 100 km/hr to 250 km/hr in 5 minutes. What is its acceleration?

probably not if net force is zero

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

3. dark matter

empty space could also be a simple vacuum