Which of the following is considered a high power rocket?

In rocketry, the classification of a high power rocket is often defined by the specifications of its motor performance. The criteria you provided highlight important aspects that determine whether a rocket falls into the high power category.

The definition that a high power rocket includes a motor with more than 160 Newton-seconds of total impulse is particularly significant. Total impulse is a measure of the total change in momentum provided by the rocket motor during its burn, and exceeding this threshold indicates that the rocket can produce significant thrust over a sustained period, which is characteristic of high power rocketry.

Additionally, while average thrust is a relevant factor, it's often less decisive in classification than total impulse. However, an average thrust in excess of 80 Newtons further emphasizes the capability and performance of the rocket, suggesting that it is designed for larger scale flights, typical of high power rocketry.

Therefore, both specifications—average thrust above 80 Newtons and total impulse greater than 160 Newton-seconds—reinforce the classification of the rocket as high power. This corroboration of criteria is essential for proper classification, which is why recognizing that both conditions contribute to the definition of a high power rocket is correct. Thus, selecting the choice that includes both points as correct captures the full understanding