A disc of radius r = 20 cm is rotating about its axis with an angular speed of 20 rad s–1. It ….

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A disc of radius r = 20 cm is rotating about its axis with an angular speed of 20 rad s^–1_. It is gently placed on a horizontal surface which is perfectly frictionless (as shown in the figure). What is the linear speed of point A on the disc?

Options :-

1. 1 ms^–1
2. 3 ms^–1
3. 2 ms^–1
4. 4 ms^–1

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