19.
A boy of mass 40 kg is running on the rough wooden
plank with acceleration of 4 m/s- which is present of
rough horizontal surface. Then minimum coefficient
of friction between plank and surface so that plank
will be in static equilibrium if mass of plank is 40 kg
77
(1) 0.33
(2) 0.4
(3) 0.2
(4) 0.1
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Answer:
0.33
Explanation:
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