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A block of mass 3kg is attached with an ...

A block of mass 3kg is attached with an ideal spring of spring constant 900 N/m. The other end of the spring connected with a rigid wall. A fixed convex mirror of radius of curvature 120 cm is placed at a distance 110 cm from the block and the spring is in its natural length. the spring is extended by 100 cm and released. the speed of the image of block is `(15/n) m/s`, when extension in the spring remains 50 cm. Find the value of 'n'.

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