At t=0, the lower end of the bar A is just above the upper end of bar B (mass of bar A=3 kg, mass of bar kg). Find time (in sec) when upper end of block A just crosses the lower end of .8. (Assume the system was released at t=0).
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Figure shows block A a motor C mounted on a with combined mass m and another block B of mass 2m. Block B is attached to shaft of motor with a light inextensible string. Motor is switched on at t =0 and string starts winding on its shaft and block B starts moving at acceleration a. If initial separation between blocks is l then find the time after which the two bodies will collide. The friction coefficient between blocks and ground is .
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