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A block is tied within two spring, each ...

A block is tied within two spring, each having spring constant equal to `k`. Initially the springs are in their natural length and horizontal as shown. The block is released from rest. The springs are ideal, acceleration due to gravity is `g` downwards. Air resistance is to be neglect. The natural length of spring is `l_(0)`.

If the block is under equilibrium and the angle made by the spring with horizontal is `60^(@)` then the mass of the block is:

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