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A small block of mass 100 g is tied to a spring of spring constant 7.5 N/m and length 20 cm. The other end of spring is fixed at a particular point A. If the block moves in a circular path on a smooth horizontal surface with constant angular velocity 5 rad/s about point A, then tension in the spring is-

1. 0.75 N
2. 0.25 N
3. 0.50 N
4. 1.5 N

Correct answer: 0.75 N

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