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

The total impulse (It) is a key measurement in rocketry that reflects the total thrust produced by a motor over its burn time, expressed in Newton-seconds. The J motor range is specifically defined to encompass total impulses from 1000 to 1249 Newton-seconds.

In this context, the chosen answer of 1000 Newton-seconds falls directly within that designated range, making it the only option classified as a J motor. This classification signifies that a motor with a total impulse of 1000 Newton-seconds adheres to the parameters established for J motors, thereby fitting within the expected range for effective performance in rocketry applications.

The other options, while indicative of total impulse measurements, either fall below or exceed the defined range for J motors, making them unfit for classification within that specific category.