An Unfueled 1000-Kg Experimental Rocket Sled at Rest on Level

Multiple Choice

An unfueled 1000-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 160 m/s after the burn.What average force is experienced by the rocket during the burn?

A) 0.80 × 10⁴ N
B) 0.75 × 10⁴ N
C) 0.60 × 10⁴ N
D) 0.35 × 10⁴ N