Which motor is NOT considered a high power rocket motor?

The correct answer is characterized by the total impulse measurement, which is a crucial factor in categorizing rocket motors into different classifications, including high power and low power. In rocketry, motors classified as high power typically have a total impulse greater than 40 Newton-seconds. In this context, the motor described in the first option has 150 Newton-seconds of total impulse, which indeed qualifies it to be a high power motor. However, when considering the total impulse regarding its relation to classes, it is also important to consider the average thrust and propellant mass.

In this specific question, while the motor with 150 Newton-seconds does classify as a high power motor, depending on additional parameters, the characterization might come under scrutiny for practical applications. However, since the definition aligns with the standard categorization, it can be misleading when considering the other options. To assess whether a motor is not high power, we are looking for a motor that either falls below the high power threshold or does not meet the conventional definitions of high power rocketry based on performance criteria.

In the context of the question, it's important to understand that 150 Newton-seconds qualifies most motors as high power, yet when compared to other choices given, the implications of average thrust