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Q.

A sphere is rolling on a frictionless surface as shown in figure with translational velocity V ms^-1. if it is to climb the inclined surface then V should be

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a

$\frac{10}{7} gh$

b

$\geq \sqrt{2 gh}$

c

2 gh

d

$\geq \sqrt{\frac{10}{7} gh}$

answer is D.

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Detailed Solution

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$\begin{array}{l} \frac{1}{2} {MV}^{2} + \frac{1}{2} I ω^{2} \geq Mgh \\ V \geq \sqrt{\frac{10}{7} gh} \end{array}$

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