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A hollow spherical ball of uniform density rolls up a curved surface with an initial velocity

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A hollow spherical ball of uniform density rolls up a curved surface with an initial velocity 3 m/s (as shown in figure). Maximum height with respect to the initial position covered by it will be ____ cm.

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Correct answer is 75

At highest point KEf = 0

Initial KE = Translational KE + Rotational KE

Apply energy conservation

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