Which of these units would be used to estimate the density of a tennis
ball?
a) g/mm3
b) g/cm3
c) kg/cm3
d) kg/m3

answer: b

explanation:

a tennis ball is about 50 grams so using kg would result in a decimal which we don't really want.

also, a tennis ball is pretty big (about 8cm^3) so using mm^3 wouldn't make too much sense since it would result in a big number (8000 mm^3).

so g/cm^3 would make the most sense.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.