Two masses of $10\,kg$ and $20\,kg$ respectively are connected by a massless spring as shown in figure. A force of $200\,N$ acts on the $20\,kg$ mass at the instant when the $10\,kg$ mass has an acceleration of $12\,ms ^{-2}$ towards right, the aceleration of the $20\,kg$ mass is:
Two masses of $10\,kg$ and $20\,kg$ respectively are connected by a massless spring as shown in figure. A force of $200\,N$ acts on the $20\,kg$ mass at the instant when the $10\,kg$ mass has an acceleration of $12\,ms ^{-2}$ towards right, the aceleration of the $20\,kg$ mass is:
- A
$4\,ms ^{-2}$
- B
$2\,ms ^{-2}$
- C
$10\,ms ^{-2}$
- D
$20\,ms ^{-2}$
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