there r plenty of opinions above...almost all of them r correct...i blv both a and b r correct and the ans given in book is wrong....as far as shubam has written...see u r absolutely right in analysing then forces but these forces act at the centre and not the point of contact of ball with the ground as a result they cant result in torques and hence rotation...
cheers
a 2nd year IIT DELHI student, doing B.Tech in chemical engineering
Moderation Team
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