Aforce of 6.0 newtons changes the momentum of a moving object by 3.0 kilogram•meters per second. how long did the force act on the mass

Given: 
force F=6.0 N
 momentum of object= 3.0 KGM/S 
 solution:
 forces cause changes in the momentum of an object  
 newton's second law tells us: 
 F=ma =Δ(mv)/Δt  
 so, Δt=Δ(mv)/F 
 =3kgm/s/6N = 0.5 s 
  the force act on the mass for 0.5 S

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