A 1,500-Kg Experimental Rocket Sled at Rest on Level Frictionless

Multiple Choice

A 1,500-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant.It exhausts the propellant in a 20-s "burn." The rocket moves at 155 m/s after the burn.What average force is experienced by the rocket during the burn?

A) 0.04 × 10⁴ N
B) 1.16 × 10⁴ N
C) 1.2 × 10⁴ N
D) 0.02 × 10⁴ N
E) ​23.25 × 10⁴ N