Average speed (aka average velocity) is the change in displacement (distance) over the chance in time. 
The average velocity of the baseball is 15 meters/sec
PLEASE HELP!!! 1. the isotope sodium-20 has how many protons?
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<h2>Hey There!</h2><h2>_____________________________________</h2><h2>Answer:</h2><h2>BUNSEN BURNER:</h2>
Bunsen burner is an instrument which is used as a source of heat using natural gas or petrol. It is used for the heating, sterlization, and combustion. Bunsen burner is named after its inventor Robert bunsen.
<h2>____________________________________</h2><h3>Mechanism:</h3>Burner provide a single, continuous flame by mixing gas with air in a controlled fashion. The ratio of gas to air that is mixed together can be manually adjusted, allowing the user to control the intensity, temperature, and size of the flame.
<h2>____________________________________</h2><h3>PICTURE IS ATTACHED BELOW</h3><h2>____________________________________</h2><h2>Best Regards!</h2><h2>'Borz'</h2>