Calculate the velocity of the ball if the angular speed is 7 rad/s and radius is .2 m.(a) 2.5 m/s(b) 1.4 m/s(c) 4.5 m/s(d) 1.0 m/sThe question was asked in semester exam.Enquiry is from Regenerative Braking of DC Series Motors in section Braking of DC Motors & Induction Motors of Electric Drives

Calculate the velocity of the ball if the angular speed is 7 rad/s and

1.	Calculate the velocity of the ball if the angular speed is 7 rad/s and radius is .2 m.(a) 2.5 m/s(b) 1.4 m/s(c) 4.5 m/s(d) 1.0 m/sThe question was asked in semester exam.Enquiry is from Regenerative Braking of DC Series Motors in section Braking of DC Motors & Induction Motors of Electric Drives
Answer» Right choice is (b) 1.4 m/s Easy EXPLANATION: The VELOCITY of the ball can be calculated USING the relation V=Ω×r. The velocity is the vector product of angular speed and RADIUS. V = Ω×r = 7×.2 = 1.4 m/s.

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