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Find out minimum acceleration of block A...

Find out minimum acceleration of block A so that the 10 kg block doesn’t fall.

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Applying NL in horizontal direction
N = 10 a ......... (1)
Applying NL in vertical direction
10 g = `mu` N .......(2)
10 g = `mu` 10 a from (1) & (2)
`therefore a=g/mu=20m//s^(2)`
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