4.A body of mass 20 kilogram is suspended by a coil spring of natural length 50.0cm and force constant 2.0times10^(3)Nm^(-1) .The stretched length of the spring in cm is (g=10ms^(-2)) (a) 60.0cm (b) 55.0cm (c) 20.0cm (d) 10.0cm
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72kilogram
88.0cm.
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