Suppose a heel-mobile, moving in a straight line and steadily increases its speed. it moves from 15 m/s to 30 m/s the first second and from 30 m/s to 45 m/s the next second. what would be its acceleration.

Can anybody me with this? ? (picture included.)

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians?

The energy of a photon is equal to (what) times (what) of the photon.