A net force F acts on an object of mass m that is initially at rest. The object moves in astraight

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A net force F acts on an object of mass m that is initially at rest. The object moves in a
straight line. The variation of F with the distance s is shown.
What is the speed of the object at the distance s1? Here is the link for DISCORD SERVER
Valid forever.!
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Great video but why is work done 1/2 fs? isn't it fs only without 1/2?

arsenicfortea
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How is the work theorem appliable here, tho? Aren’t we applying an external work on the mass that is not a “field force”?

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