Which of the following has a total impulse (It) in the J motor range?

In rocketry, total impulse (It) is a critical parameter that quantifies the overall performance of a motor. The J motor range is defined in terms of total impulse, specifically in the range of 600 to 1200 Newton-seconds. Therefore, a total impulse of 1000 Newton-seconds falls perfectly within this range, making it the correct choice.

Total impulse is calculated by multiplying the thrust of the motor by the total burn time, and different letters are used to categorize impulse ranges in rocketry. The J motor range reflects medium power motors, suitable for a variety of model and high-power rocketry applications. It is essential for those involved in rocketry to understand these classifications to choose appropriate motors for their projects, ensuring safety and performance. The other options listed either fall below 600 Newton-seconds or exceed 1200 Newton-seconds, placing them outside the defined J motor range.