A thin string of negligible mass with one end fixed to the roof is wound around a circular disc of radius 2 m and mass, 10 kg as shown below. The disc rolls vertically down under the action of its own weight. Considering acceleration due to gravity as 10 m/s, the tension in the string is (a) 0 N (c) 33.3 N Disc (b) 25.0 NS (d) 50 N