john whirls a ball on the end of a string in a horizontal circle a radius R at constant speed v. If he wants to increase the centripetal acceleration of the ball by a factor of 4 what must he do?
a. keep the speed fixed and increase the radius by 4
b. keep the radius fixed and increase the speed by 4
c. keep the radius fixed and increase the speed by 2
d. keep the speed fixed and decrease the radius by 2
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