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:

no. dot product   =0 when vecs at right angles

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