the first step would be gathering information , and making sure its correct 
 
        
             
        
        
        
Answer:
 88.2 N
Explanation:
Datos
Lcubo = 10 cm = 0.1 m
Vcubo = Vfluido desalojado= 0.1 m x 0.1 m x 0.1 m = 10-3 m
mcubo = 10 kg
dfluido = 1000 kg/m3
g = 9.8 m/s2  
Sabemos que el peso aparente de un cuerpo que se sumerge en un fluido es:
Paparente=Preal−Pfluido
Teniendo en cuenta que:
Preal = mcubo⋅gPfluido=E= dfluido⋅Vfluido⋅g
Como el cuerpo se sumerge completamente en el fluido, el volumen de fluido desalojado es exactamente el volumen del cubo. Por lo tanto si sustituimos los datos que nos proporcionan en el enunciado en la primera ecuación:
Paparente=mcubo⋅g−dfluido⋅Vfluido⋅g ⇒Paparente=10 kg ⋅9.8 m/s2 − 1000 kg/m3 ⋅10−3 m ⋅9.8 m/s2 ⇒Paparente = 88.2 N
 
        
             
        
        
        
F=ma
m=total mass = 2300kg+2500kg=4800
F=18000N
a=?
a=F/m
a=18000/4800
a=3.8m/s^2
Final answer
        
                    
             
        
        
        
Answer:
B. 2 meters. 
Explanation:
To rotate the capstan a certain amount of torque is required, and if each sailor applies a force  at a distance
 at a distance  from the center, then for two sailors the total torque will be
 from the center, then for two sailors the total torque will be 
 ;
; 
therefore,  for one sailor to apply the same torque it must be that the torque  he applies must be equal to the torque that the two sailors applied:
 he applies must be equal to the torque that the two sailors applied: 

which gives 
 .
.
and since  ,
,

which is choice B.