When does a work is considered done? What do you mean by 'fuel Name some common fuels. What is the greatest source of energy on Earth? What is hydropower?
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a) Work is said to be done when force applied on the body makes it move.
b) A material burned to produce heat or power.
c) Petroleum, coal, wood and so on.
d) Sun
e) Using fast flowing water to produce electricity is hydropower.
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