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a particle is projected up an inclined plane of inclination beta(b) at an elevation alpha(a) to the inclined plane. find the value of product tan(a).tan(b) if the particle strikes the inclined plane vertically. (ans-0.5)
as horizontal velocity along the inclined plane is given by
Vx = ucosa - g sinb (2u sina/g cosb ) as the acc along the inclined plane is given by -gsinb and and total time taken is given by 2u sina / gcosb .
now , as it fall vertically on the inclined plane so Vx = 0
or , u cosa - 2u sina tanb = 0
tan(a ).tan(b) = 1/2
tan(a) . tan(b) = 0.5
take the co-ordinate axis along the inclined plane and Perpendicular to it.
X-direction:->
V=u+at
0=ucos(a)-gsin(b)*t
t=ucosa/gsinb
y direction
-usina=usina-gcosb*t
substitute the value of t, u will get the ans.
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