The Newton's second law states
"F=ma"The acceleration of a car
"a=\\frac{\\Delta v}{\\Delta t}=\\frac{0\\:\\rm{m\/s}-45(\\rm{1000\\:m\/3600\\: s})}{10\\:\\rm{s}}=-1.25\\:\\rm{m\/s^2}"Finally, the magnitude of the force exerted on a car
"F=1000\\:\\rm{kg}\\times 1.25\\:\\rm{m\/s^2}=1250\\:\\rm{N}"
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