A spring with k = 10 N/m is stretched from 0.2 m to 0.5 m. The force needed is:

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

a.   mass number from atomic number

because growing process had stoped after 4-5 year