Q 19. In me given figure, find mass of the block A, if it remains at rest, when the system is released from rest. Pulleys and strings are massless.[g= 10m/s2] (A) m (B) 2m (C) 2.5m (D) 3m Share with your friends Share 3 Sakshi Kanwar answered this Dear StudentQ19 In the given figure The mass A is at rest By pulley problems 3mg-T=3maand on block of mass m; T-mg=maSo T=mg+maPut in equation 1st than 3mg-(mg+ma)=3maa=g/2therefore 3mg-T=3m×g/2T=mg/2 So net tension will be 2T that is 2×mg/2=mgAs the mss A is at rest so 2T is balancing mass Amag=mgma=m Hope this information will clear your doubts about topic. If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible. Regards -5 View Full Answer
