Part 1: I got one answer correct, but there are multiple correct answers. Part 2

Question

Part 1: I got one answer correct, but there are multiple correct answers.

Part 2: I selected the highlited answer but it was incorrect .

A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. Which way(s) can increase the centripetal acceleration of the ball by a factor of 9? increasing both the radius and the speed by a factor of 9 Keeping the speed fixed and decreasing the radius by a factor of 9 Keeping the speed fixed and increasing the radius by a factor of 9 Keeping the radius fixed and increasing the speed by a factor of 9 decreasing both the radius and the speed by a factor of 9 Keeping the radius fixed and increasing the speed by a factor of 3

Explanation / Answer

Part I: Options ii) and vi) are correct.

As centripetal acceleration = a = v^2/R

Part II: Option v) is correct.

By, the Newton's Third Law

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