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Q.

A sharp vertical impulse J is given to a uniform solid sphere of mass m and radius R placed on a rough horizontal surface.  Choose  the correct options. ( Neglect impulse due to weight of the sphere and consider that sphere does not bounce up).
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a

Minimum value of coefficient of friction between sphere and surface to avoid slipping is  μ=47.

b

If  μ=1320, sphere rolls with forward slipping.

c

If  μ=1120,  sphere rolls with backward slipping.

d

Impulse imparted to the sphere by the surface, perpendicular to the surface will also Have magnitude J.

answer is A, B, C.

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Detailed Solution

JRcos37J'R=25mR2ω4J5J'=25mV    AndJ'=mV

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4J5=75mv    J=74mv     butJ'μJmvμ47

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