They all produce light and stuff
Friction- the external force that acts on objects and causes them to slow down when no other external force acts upon them.
Answer: two waves with identical crests and troughs meet
Explanation:
My teacher gave me the answer
Its readily available
No Harmful emissions
Environment friendly
Renewable
Hydrogen isn't very good fuel source due to its high flammability and can create a nasty mini hydrogen bomb. <span />
