Question

What should be the angle of throw of an object in order to fall at a longer distance?

Answer 1

let at ∅ angle we through the ball with velocity u .
then, after x distance strike to ground .

x is range of ball using oblique projectile formula,
x =u²sin2∅/g

x is maximum when sin2∅ =1
sin2∅ = sin90°

2∅ = 90°

∅ = 45°