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M1 has a mass of 5.01 kg. It is on a horizontal surface, connected by a light string to a hook. Mass M2 can be increased smoothly by adding masses little at a time. The pulley has a negligible mass and no friction.

When M2 is 2.40 kg it begins to accelerate downwards at a rate of 1.52 m/s2. Calculate s -k for M1 on the surface.

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