Answer :
In circular motion the speed of the ball is 879.2 cm/s.
s = 2πrt
Here, s = speed in circular motion
π = 3.14
r = radius, given = 40 cm
t = time period, given = 3.5 s
Put these values in the formula, s = 2πrt
s = 2 × 3.14 × 40 × 3.5
s = 879.2 cm/s
Hence, in circular motion the speed of the ball is 879.2 cm/s.
In circular motion, if a body moves in a circle of radius r and covers a distance equal to the circumference of the circle, then 2 π r. This distance is covered in time t. Consequently, the speed of a body in a circular motion is S = 2 πr t. Where r is the radius of the circle and t represents the time period.
Learn more about circular motion here:- https://brainly.com/question/14672628
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