A girl throws a football with an average velocity of 18.5 m/s a distance of 52.1 m. How long does it take the ball to cross that distance?

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )

the answer is the last option

explanation:

because in order to know what the molecule is you need to know how many atoms of each element are in the molecule.