Laws of MotionHard

Question

A block is kept on a frictionless inclined surface with angle of inclination α. The incline is given an acceleration a to keep the block stationary. Then a is equal to
       

Options

A.g/tan α
B.g cosecα
C.g
D.g tan α

Solution

       
mg sinα = ma cos α
∴     a = gtanα

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