Question

A golf ball is hit from a horizontal surface with an initial speed of $25.0m/s$.
Which launch angle (above the horizontal surface) would cause the golf ball to be in the air longest?

• A. ${25}^{\circ }$
• B. ${35}^{\circ }$
• C. ${45}^{\circ }$
• D. ${55}^{\circ }$
• E. ${65}^{\circ }$

Answer 1

The correct option is E ${65}^{\circ }$

The time of fight of the object in air is given by

$t=\frac{2u_y}{g}=\frac{2usin\theta }{g}$

Hence to maximize time of flight for a constant initial speed of throw, $\theta$ must be maximized.

Thus in the given options, the time of flight will be greatest for ${65}^{\circ }$