Question

the last 2.00 km of track uses water brakes (a scoop that displaces water) to slow the rocket down. what is the acceleration of the sled if it stops at the end of the water brake zone?

Answer 1

Zero, when stopped.

Step-by-step explanation:

If the sled stops, it's acceleration is 0 at that point. The acceleration was negative from the point the sled starts using water brakes.