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The masses of `10kig` and `20kg` respectively are connected by a massless spring as shown in figure. A force of `200N` acts on the `20kg` mass. At the instant shown, the `10kg` mass has acceleration `12m//sec^(2)` . What is the acceleration of `20kg` mass?

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The correct Answer is:
4
Spring force `F_(s) =` Net force on `10kg` mass
`= 10 xx 12 = 120 N`
`kg, 200 -120 -20a rArr a =4ms^(-2)`
.
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