Question

For a projectile, an of the horizontal distance covered by it is maximum when the angle of projection is ____ .

• A. ${90}^o$
• B. ${45}^o$
• C. zero
• D. ${30}^o$

Answer 1

The correct option is B ${45}^o$

Horizontal range of the projectile is given by $R=\frac{u^{2}sin2\theta }{g}$

Horizontal range is maximum when $\sin 2\theta =1$

$\therefore$ $2\theta ={90}^o$

$⟹\theta ={45}^o$