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  4. Only under gravity and some initial impulse a sphere cannot roll without sliding on :

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Q. Only under gravity and some initial impulse a sphere cannot roll without sliding on :

System of Particles and Rotational Motion

Solution:

A sphere cannot roll on a surface where no torque is present to provide the rotational motion in accordance with the linear motion of sphere due to gravity hence only option (B) is the case among other given cases where sphere cannot roll without sliding.