Question

Buestion - A particle
at an
the
projected
angle x' with horizontal from
plane whose inclination
to a horizontal is
B.
will strike the plane at
foot of
Show that it
lane at right angles if,
cot p =
2 taun (1-9)
C​

Answer 1

Answer:

sorry I didn't know

Answer 2

Answer:

In this question

first Let us assume that that that velocity of the projectile at the point of inclination be v

so we break the v as in the direction parallel to the inclined and perpendicular to the inclined plane that are vcosβ and vsinβ

so we know that the projectile strikes the inclines plane perpendicular to the surface so the velocity of the projectile along the plane should be zero .

now acceleration the projectile in the  direction perpendicular to the plane is gcosα 

acceleration the projectile in the  direction parallel to the plane is gsinα 

as the velocity of the projectile along the plane should be zero when it strike the plane

we know the  time period of a projectile  or we can get it as the displacement of the projectile is zero in dirction perpendicular to the inclined plane 

so    0=(vsinβ)t−21(gcosα)t2

so    T=gcosα2vsinβ

now we know that the  velocity of the projectile along the plane should be zero

so    we will use  parallel to the plane

v=u+a∣∣T

so here u=gcosβ and  a∣∣=−gsinα and  T as calculated above and  v = 0

so  

so          by solving this       

so    

option (a)