The velocity of a car decreases from 30 m/s to 18 m/s in a time of 4 seconds. What is the average acceleration of the
car in this process?

-3 m/s²

Explanation:

average acceleration formula: (final velocity - initial velocity) ÷ time

FV: 18 m/s

IV: 30 m/s

T: 4 s

that is equal to -3

hopefully this is correct :)

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 .