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A plank of mass 10kg rests on a smooth horizontol surface. Twol blocks A and B of masses Ma = 2kg and Mb=1 kg lies at a distance of 3m on the plank. The friction coefficient between the blocks are Ua=0.3 and Ub=0.1. A force of F=15N is applied on the plank in horizontol direction. Find the time (in sec) after which block A collides with B .

A plank of mass 10kg rests on a smooth horizontol surface. Twol blocks A and B of masses Ma = 2kg and Mb=1 kg lies at a distance of 3m on the plank. The friction coefficient between the blocks are Ua=0.3 and Ub=0.1. A force of F=15N is applied on the plank in horizontol direction. Find the time (in sec) after which block A collides with B . 

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