A particle is projected at an angle Alpha to the horizontal which grazes with top of the Wall of height B located at a horizontal distance of A from point of projection. then H max of the projectile is?

projectile-motion
solved
#1

A particle is projected at an angle Alpha to the horizontal which grazes with top of the Wall of height B located at a horizontal distance of A from point of projection. then H max of the projectile is?????

#2

What's the answer @Sai_2020?

#3

#4