The ends of spring are attached to blocks of mass 3kg and 2kg. The 3kg block rests on a horizontal surface and the 2kg block which is vertically above it is in equilibrium producing a compression of 1 cm of the spring. The 2kg mass must be compressed further by at least ………., so that when it is released, the 3 kg block may be lifted off the ground.
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2.5 cm
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