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If one end of vertical spring is connected to the ground and other end is connected to horizontal platform at rest. If a ball of mass m is dropped on it from height h above platform compresses spring by h/2. If h = 10 cm find k.

Options: (a) 120 mg (b) 200 mg (c) 180 mg (d) 130 mg

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Correct option is A) 120mg

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