Your teammate is spinning a tennis ball on a string in a perfect circle. If the radius of the circle is 45 cm and the ball travels half the
circumference of the circle in 15 seconds, what is the velocity of the ball rounded to the nearest whole number?
A
3 m/s
B)
30 cm/s
94 cm/s
D)
212 cm/s

The velocity of an object in circular motion is the distance traveled over time. The distance traveled is the circumference. Half the circumference of a circle with radius r is πr. The velocity is this distance over time, in this case, 1.5 s. The ball’s velocity is therefore

πr

t

=

45π

0.5

≈ 94.2 cm/s

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Your teammate is spinning a tennis ball on a string in a perfect circle. If the radius of the circle is 45 cm and the ball travels half the circumference of the circle in 15 seconds, what is the velocity of the ball rounded to the nearest whole number? A 3 m/s B) 30 cm/s 94 cm/s D) 212 cm/s

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Your teammate is spinning a tennis ball on a string in a perfect circle. If the radius of the circle is 45 cm and the ball travels half the
circumference of the circle in 15 seconds, what is the velocity of the ball rounded to the nearest whole number?
A
3 m/s
B)
30 cm/s
94 cm/s
D)
212 cm/s