A point moves along a circle having a radius \( 20 \mathrm{~cm} \) with a constant tangential ac....

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A point moves along a circle having a radius \( 20 \mathrm{~cm} \)
\( \mathrm{P} \)
with a constant tangential acceleration \( 5 \mathrm{~cm} / \mathrm{s}^{2} \). How much time is needed after motion begins for the normal acceleration of the point to be equal to tangential acceleration?
(A) \( 1 \mathrm{~s} \)
(B) \( 2 \mathrm{~s} \)
(C) \( 3 \mathrm{~s} \)
(D) \( 4 \mathrm{~s} \)


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