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A spring has a natural length of 50 cm a...

A spring has a natural length of `50 cm` and a force constant `2 xx 10^3N/m`. A body of mass 10 kg is suspended from it and the spring is stretched . If the body is pulled down further stretching the string to a length of 58 cm and released, it executes simple harmonic motion. The force on the body when it is at its lowermost position of oscillation will be

A

`160 N`

B

`40 N`

C

`60 N`

D

`80 N`

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