B when is spins it means its rotating east and west directions
        
             
        
        
        
Answer:
   W = 8.92 10² kJ
Explanation:
For this exercise they give us the strength, we must calculate the distance traveled, for this we need the rocket acceleration let's use Newton's second law
         F = m a
         a = F / m
         a = 20 103/1400
         a = 14.29 m/s²
With kinematics we can find the distance traveled
        ² = v₀² + 2 a x
² = v₀² + 2 a x
       x = (  ²-v₀²) / 2 a
²-v₀²) / 2 a
       x = (50² -35²) / 2 14.29
       x = 1275 / 28.58
       x = 44.61 m
Let's calculate the work
       W = F.d
The bold is vector; as indicated by the force is in the direction of movement the scalar product is reduced to the ordinary product
      W = F d
      W = 20 10³ 44.61
      W = 8.92 10⁵ J
      W = 8.92 10² kJ