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In the circuit shown here, what is the v...

In the circuit shown here, what is the value of the unknown resistor R so that the total resistance of the circuit between points P and Q is also equal to R

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The correct Answer is:
D
As no external force acts on the two blocks friction acts like an internal force and thw two blocks will move with common velocity.
By applying conservatin of momentum
`(1 kg) (15 m//s) = 1v = 2v rArr v = 5 m//s`
`P_(1) = 5 N-s , P_(2) = 10N-s`
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