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Q.

A block of mass 6 kg is placed on a horizontal surface. Coefficient of friction between the surfaces in contact is 0.8. If a horizontal force of 30 N acts on the block then the frictional force on the block is ( g= 10 ms^-2)

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a

66 N

b

30 N

c

48 N

d

60 N

answer is D.

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Detailed Solution

$f_{l} = μ m g = 0.8 \times 6 \times 10 = 48 N$

$\begin{array}{l} \Rightarrow F_{} < f_{l} \\ \Rightarrow f = 30 N \end{array}$

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