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A box of mass 10 kg is lowered with a do...

A box of mass 10 kg is lowered with a downward acceleration `4 m//s^(2)` . In the box there is a spring whose lower end is fixed to the box and a ball of mass kg is kept on its loose end, as shown below. At a certain instant when the spring (spring constant `= 100 N//m`) is found to be compressed by `5 cm`, tension in the cable `T` is :

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