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

Multiple Choice

A 1 500-kg experimental rocket sled at rest on level frictionless rails is loaded with 55.0 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) 4.26E+2 N
B) 1.16E+4 N
C) 1.21E+4 N
D) 1.94E+2 N
E) ​2.33E+5 N