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A block of mass 20 kg is pushed with a horizontal force of 90N. If the coefficient of static and kinetic friction are 0.4 and 0.3, the frictional force acting on the block is (g =10ms-2 )

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a

90N

b

80N

c

60N

d

30N

answer is C.

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fk=μkN,N=mg

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A block of mass 20 kg is pushed with a horizontal force of 90N. If the coefficient of static and kinetic friction are 0.4 and 0.3, the frictional force acting on the block is (g =10ms-2 )