Just a question about simple moving body exercise. With no acceleration. Body moves with speed 15 m/s, time 12 seconds, mass 0.8 kg, and the force have a side effect 5 Newtons. Firstly, F=mg, so 0,8*0,98.Then I calculated the actual moving direction's force by pythagoros, thats 0,95N. Should i use cosinus or what ?