Final answer:
The minimum arrow length for hunting depends on local regulations and cannot be definitively answered from the given options. The optimum angle for maximum projectile distance is 45°.
Step-by-step explanation:
The minimum length that an arrow must be for hunting purposes is not specified in your options as it can vary depending on the jurisdiction and the type of game being hunted. Generally, there are hunting regulations that hunters must follow, including specifications for equipment such as bows and arrows. It is important for hunters to consult their local wildlife agency or hunting regulations for the correct minimum length required in their area. Without a specific jurisdiction mentioned, no definitive answer can be provided from the options given.
Regarding the optimum angle at which a projectile should be launched to cover the maximum distance, the answer is b) 45°. This is because, under ideal conditions and assuming no air resistance, the angle that gives the longest range for projectile motion is 45 degrees. At this angle, the horizontal and vertical components of the initial velocity are equal, which allows the projectile to spend more time in the air while still maintaining a significant horizontal velocity, resulting in the farthest distance achieved.