Which of the following is true about density? A. Density depends on temperature and weight.
B. Density describes how much energy atoms have.
C. A large object will always have more density than a smaller
object.
D. Density can be calculated by dividing the mass by the volume.

D

Explanation:

density of a substance is mass per unit volume

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.