Final answer:
The acceleration of the rocket-powered sled is approximately -175.41 m/sec², indicating deceleration.
Step-by-step explanation:
The acceleration of the rocket-powered sled can be calculated using the formula:
acceleration = (final velocity - initial velocity) / time
Substituting the given values, we have:
acceleration = (123 m/sec - 444 m/sec) / 1.83 seconds
acceleration = -321 m/sec / 1.83 seconds
acceleration ≈ -175.41 m/sec²
The negative sign indicates that the sled is decelerating.