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Question Number 64750 by necx1 last updated on 21/Jul/19

A body of mass 4kg is at the point of  slipping down a plane which is  inclined at 30° to the horizontal.What  is the force parallel to the plane that  will just move it up?

$${A}\:{body}\:{of}\:{mass}\:\mathrm{4}{kg}\:{is}\:{at}\:{the}\:{point}\:{of} \\ $$$${slipping}\:{down}\:{a}\:{plane}\:{which}\:{is} \\ $$$${inclined}\:{at}\:\mathrm{30}°\:{to}\:{the}\:{horizontal}.{What} \\ $$$${is}\:{the}\:{force}\:{parallel}\:{to}\:{the}\:{plane}\:{that} \\ $$$${will}\:{just}\:{move}\:{it}\:{up}? \\ $$

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