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Three blocks of masses $10\text{ kg}$, $20\text{ kg}$ and $30\text{ kg}$ are pushed by a $60\text{ N}$ force, as shown in the figure above. Assume all surfaces are frictionless.

What is the force exerted on the $30\text{ kg}$ block by the $20\text{ kg}$ block?

A

$60\text{ N}$

B

$50\text{ N}$

C

$30\text{ N}$

D

$20\text{ N}$

E

$10\text{ N}$

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