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Two blocks A and B attached to each othe...

Two blocks A and B attached to each other by a massless spring or kept on a rough horizontal surface (`mu=0.1`) and pulled by a force of200N as shown in figure. If at some instant, the 10 kg mass has an acceleration of `12 ms^(-2)` . what is the acceleration of 20 kg mass (in `ms^(2)`).

Text Solution

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For A, Kx `-mum_(A)g = m_(A) a rArr kx -0.1 (10) (10) = 10(12)`
For B: `200 - kx - mu m_(B)g = m_(B)a`
`200-130 -0.1(20) 10 = 20 a rArr a = 2.5 ms^(-2)`
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