The answer is said to be 4.8*10^6 N*s for a and for b it is 1.9*10^4 N forward.

82. A 1990 kg rocket sled on horizontal frictionless rails 88 is loaded with 102 kg of propellant. It exhausts the propellant in a burn of 25 s. The rocket starts at rest; it moves with a speed of 240 m/s after the burn. (4.5) (a) Determine the impulse experienced by the rocket sled. (b) Calculate the average force experienced by the rocket during the burn. late