# What should be the angular velocity of disk B so that the linear velocity of both the disks remains same.

## Two circular disks A and B of the same mass but are with different radii r_{A}=10cm and r_{B}=20cm respectively. Disk A rotates with an angular velocity of 60 rad/s. What should be the angular velocity of disk B so that the linear velocity of both the disks remains same.

a. 25 rad/s

b. 20 rad/s

c. 30 rad/s

d. Data insufficient

Correct Answer : c. 30 rad/s

**Explanation :**

Using the formula v = rω where v is the linear velocity, r is the radius of disk and ω is the angular velocity.