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A block of mass 50kg can slide on a roug...

A block of mass 50kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull, acting `30^(@)` to the upward drawn vertical, which causes the block to just slide is `: ( g = 9.8 m//s^(2))`

Text Solution

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`3x-7y^2+3xyz=3(2)-7(-4)^2+3(2)(-4)(1)`
`=6-7xx16-6xx4`
`=6-112-24`
`=6-136`
`=130`
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