A flat rail road car is accelerating alo...

A flat rail road car is accelerating along the positive x-axis with an acceleration `a_(p)`. A sphere is placed over the car. The friction between the car and the sphere is not sufficient to support pure rolling of sphere. The correct statement is

The sphere will slip and force of friction on sphere is along -x direction

The sphere will slip and force of friction on sphere is along +x direction

Acceleration of sphere is along -x direction

None of the above

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