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Two blocks `A & B` attached to each other by a mass-less spring, are kept on a rough horizontal surface `mu=0.1`. A constant force `F=200 N` is applied on blcok `B` horizon tally as shown below. If a some instant the acceleration of `10 kg` mass is `12 m//s^(2)`, then the acceleration of `20 kg` mass is

A

`2.5 m//s^(2)`

B

`4.0 m//s^(2)`

C

`3.6 m//s^(2)`

D

`1.2 m//s^(2)`

Text Solution

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The correct Answer is:
A
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