A projectile is fired at an angle of 45° with the horizontal.

A projectile is fired at an angle of 45° with the horizontal. Elevation angle of the projectile at its highest point as seen from the point of projection is

H =	u² sin² 45°	=	u²	.....(1)
	2g		4g

R =	u² sin 90°	=	u²
	g		g

	R	=	u²	.....(2)
	2		2g

∴ tan α =	H
	R / 2

∴ α = tan^-1		1
		2

tan^-1		√3
		2