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Q.

A uniform cylinder of mass M and radius R rolls without slipping down a slope of angle θ with horizontal. The cylinder is connected to a spring of force constant K at the center, the other side of which is connected to a fixed support at A. The cylinder is released when the spring is unstretched. Till it comes to momentary rest for the first time, the force of friction (f) on cylinder is
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a

Always downwards

b

Initially down wards and then becomes upwards

c

Initially upwards and then becomes down wards

d

Always upwards

answer is C.

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