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What are the two things that must happen...

What are the two things that must happen for work to be done?·

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A force must be applied on an object and the object must move in the direction of the force.
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S CHAND IIT JEE FOUNDATION-WORK AND ENERGY-QUESTION BANK -3
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  18. When you hit a nail into a board by using a hammer, the head. of the n...

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