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Two blocks of masses 40 kg and 20 kg are...

Two blocks of masses 40 kg and 20 kg are connected by a wire that has a linear mass density of `1 g//m`. These blocks are being pulled across horizontal frictionless floor by horizontal force F that is applied to 20 kg block. A transverse wave travels on the wave between the blocks with a speed of `400 m//s` (relative to the wire). the lmass of the wire is negligible compared to the mass of the blocks. the magnitude of F is

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