If W is weight of a body, α is angle of an inclined plane and ϕ is angle of friction, then the force required to drag the body when it is just impending to move the plane, is_____

If W is weight of a body, α is angle of an inclined plane and ϕ is

1.	If W is weight of a body, α is angle of an inclined plane and ϕ is angle of friction, then the force required to drag the body when it is just impending to move the plane, is_____
A.	W tan(α + ϕ)
B.	W cos(α + ϕ)
C.	W sin(α + ϕ)
D.	W sec(α + ϕ)
Answer» B. W cos(α + ϕ)

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