An apple falls from a tree. it hits the ground at a speed of about 8 m/s . what is the approximate height of the tree?

The motion of the apple is a free fall motion, so it is a uniformly accelerated motion. Therefore, we can use the following equation:

where

v=8 m/s is the speed of the apple when it hits the ground

u=0 is the initial speed of the apple

is the free-fall acceleration

h is the height from which the apple has fallen

Substituting data and rearranging the equation, we can find the height of the tree, h:

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.