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51. A block is moving along y-axis with velocity A 4 on a plank relative to ground and the plank is moving along x-awith velocity Vp 3i at any instant of time. The unit vector in direction of friction force acting on block at this momeof time is3i+ 4j53i -4j-3i + 4j(3) 5(4)1-3i-4j5

Answer»

velocity of block w.r.t plank = Vb-Vp = 4j-3i and unit vector will be = (-3i+4j)/5

now , friction always acts opposite to the velocity of the body

so, unit vector along the Frictional force = -[-3i+4j]/5 = (3i-4j)/5

option B



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