in which of the following scenarios does acceleration occur?
a child gets on a bicycle and begins pedaling down the sidewalk.
b. awoman walks toward a grocery store then turns around and walks bac
c. a car moving up a road slows down and stops at a red light.
d. all of these

The correct answer is all of these. The first one has positive acceleration, and the last two have negative acceleration.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."