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Q.

A block of mass 5 kg is placed on a horizontal surface with coefficient of friction $μ = 0.2$ , then the maximum and minimum value of force F respectively for which the block remains at rest $(g = 10 m s^{- 2})$

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a

15 N, 10 N

b

10 N, 25 N

c

25 N, 5 N

d

5 N, 10 N

answer is C.

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Detailed Solution

Question Image

$f = μ m g = 0.2 \times 5 \times 10 = 10 N$

$F_{\min} + 10 = 15$

$F_{\min} = 5 N$

Question Image

$F_{\max} = 15 + f = 25 N$

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A block of mass 5 kg is placed on a horizontal surface with coefficient of friction μ=0.2, then the maximum and minimum value of force F respectively for which the block remains at rest (g=10ms−2)