A particle is projected up an inclined plane of inclination α α to the horizontal. If the particle strikes the plane horizontally then tan α α =

Text Solution
Verified by ExpertsThe correct answer is:
D
As the particle strikes the plane horizontally, its velocity is parallel to horizontal axis so its vertical velocity is given by
0 = u sin β β - gt(v = u + at)
or u sin β β = g 
( Q t is time of flight)
or sin β β cos α α = 2[sin β β cos α α - cos β β sin α α ]
or 2cos β β sin α α = sin β β cos α α
or 2 
or 2 tan α α = tan β β or tan α α = 1/2 tan β β
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