Suppose s(t) is the position of an object moving along a line at time t is greater than or equal to 0. what is the average velocity between the times t=a and t=b? what is the instantaneous velocity at t=a?

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

the answer is b, have negligible mass