A rod and a spring, the length of which is equal to l0 in an undeformed state, are attached to a body of mass M located on a smooth horizontal surface. A coupling of mass m, also attached to a spring, moves freely (without friction) along the rod. The spring was compressed in such a way that its length became equal to l and then released. What is the amplitude of oscillations of body M relative to a horizontal surface if the bodies were initially at rest? The rod and spring are weightless.
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