A heavy solid sphere is thrown on a horizontal rough surface with initial velocity \( u \) witho....

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A heavy solid sphere is thrown on a horizontal rough
P
surface with initial velocity \( u \) without rolling. What will be its speed, when it starts pure rolling motion?
(1) \( \frac{3 u}{5} \)
(2) \( \frac{2 u}{5} \)
(3) \( \frac{5 u}{7} \)
(4) \( \frac{2 u}{7} \)


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