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Q.

A body of mass 2 kg is on an inclined plane of inclination 30o and coefficient of friction is (13). The minimum force required to move the body up the inclined plane is  (Acceleration due to gravity =10 ms−2)

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a

20 N

b

5.77 N

c

15 N

d

10 N

answer is C.

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Detailed Solution

Question Image 
Force required is,  
Fmin=mgsinθ+f, 
Fmin=mgsinθ+μ mg  cos  θ 
Fmin=mg(sinθ+μ cos  θ) 
Here, m=2kg, g=10 ms−2
μ=13   and  θ=30o  
So, Fmin=2×10(12×13×32)=20N

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