Newton's second law of motion: F=ma [tex]a = \frac{v}{t} [/tex] You convert from km/h to m/s by dividing by 3.6: [tex]v = 91 \div 3.6[/tex] [tex]v = 25.3 \: \frac{m}{s} [/tex] Then a is: [tex]a = \frac{25.3}{9} [/tex] [tex]a = 2.8 \frac{m}{s {}^{2} } [/tex] Then: F=(980)(2.8)=2744 N
