Consider a horizontal spinning disc of radius R=5.7m . A ball of mass m=2.68kg and negligible size is attached, with a clamp, to the outer edge of the disc. The disc starts at rest and experiences a constant angular acceleration, α=4.9rad/s2 .   25% Part (a)  Consider the disc at time t=19.7s . Calculate the speed, v , in meters per second, of the attached ball.