Chapter 8.5, Problem 1CYP

To determine

The smallest angle of elevation.

Answer to Problem 1CYP

  $21°$

Explanation of Solution

Given:

Distance = 25 yards

Height of the post = 10 feet

Calculation:

The ball should be 1 feet less high. Therefore,

Height = 10 − 1 = 9 feet.

The smallest angle of elevation will be:

  $\begin{array}{l}\sin x=\frac{P}{B}\\ x={\sin }^{-1}\left(\frac{9}{25}\right)\\ x={\sin }^{-1}\left(\frac{9}{25}\right)\\ x=21°\end{array}$