2.5 Explain why a spacecraft on its way to Mars has its rocket engine on only for a short period during the journey.​

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

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

it is a negative acceleration