9) A 10-kg block slides down an inclined plane making an angle of 30° with the horizontal at a constant speed. The coefficient of kinetic friction between the block and the surface is?

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

i would say

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