19. A boy of mass 40 kg is running on the rough woodenplank with acceleration of 4 m/s- which is present ofrough horizontal surface. Then minimum coefficientof friction between plank and surface so that plankwill be in static equilibrium if mass of plank is 40 kg77(1) 0.33(2) 0.4(3) 0.2(4) 0.1

19. A boy of mass 40 kg is running on the rough woodenplank with acc

1.	19. A boy of mass 40 kg is running on the rough woodenplank with acceleration of 4 m/s- which is present ofrough horizontal surface. Then minimum coefficientof friction between plank and surface so that plankwill be in static equilibrium if mass of plank is 40 kg77(1) 0.33(2) 0.4(3) 0.2(4) 0.1
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19. A boy of mass 40 kg is running on the rough woodenplank with acceleration of 4 m/s- which is present ofrough horizontal surface. Then minimum coefficientof friction between plank and surface so that plankwill be in static equilibrium if mass of plank is 40 kg77(1) 0.33(2) 0.4(3) 0.2(4) 0.1​

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19. A boy of mass 40 kg is running on the rough woodenplank with acceleration of 4 m/s- which is present ofrough horizontal surface. Then minimum coefficientof friction between plank and surface so that plankwill be in static equilibrium if mass of plank is 40 kg77(1) 0.33(2) 0.4(3) 0.2(4) 0.1