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e) 0.52 In spring motion experiment, when an object of mass 2 kg is attached vertically to a spring, the spring stretched 09: The spring constant k (in N/m) is: a) 188 b) 143 c) 250 d) 111 e) 200 010: The elastic potential energy (in J) is: a) 1.4 b) 1.8 c) 2.5 d) 0.8 .cm 14 (استطال) e) 1.0