Answer :

Angle of inclination on the plane is Ө=45˚,


The body falls through the height h = 5 m,


Acceleration due to gravity g = 10 m/s,


12.PNG


The striking velocity of the projectile with the inclined plane is





After collision, let it make an angle θ with horizontal. The horizontal component of velocity 10 cos45°= v cos Ө˚ will remain unchanged and the velocity in the perpendicular direction to the plane after collision will be







So,






Angle of reflection from the wall





Angle of projection will be





Let the distance where it falls is l



From equation of trajectory




Putting values, we get



On solving above, we get



Thus, it will hit the plane again at 18.5 m along the incline.


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