1.

A plank of mass 10kg rests on a smooth horizontalsurface. Two blocks A and B of masses mA 2 kg andmp 1 kg lie at a distance of 3 m on the plank asshown in the figure. The friction coefficient betweenthe blocks and the plank are A-0.3 and μ8-0.1. Now a force F-15 N is applied to the plank inhorizontal direction. Find the time (in sec) after which block A collides with B.HA 0.3A 3m.BM-10kgμ=0

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