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A block of mass m is attached to a spring with force constant, ? and oscillate at a frequency ?. If the mass is changed to ?′ = ?/2, and the spring force is changed to ?′ = 2?, then the new frequency ?′ of the oscillation would be, (a) ?′ = 2? (b)?′ = ? (c) ?′ = ?/2 (d)?′ = 4?

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