A car of mass $m = 1200\text{ kg}$ braking from speed $v = 20\text{ m/s}$ to a complete stop comes to rest in a distance of $s = 40\text{ m}$. What is the average braking force $F$ exerted by the brakes?

• A$3000\text{ N}$
• B$6000\text{ N}$
• C$12\text{ }000\text{ N}$
• D$240\text{ }000\text{ N}$

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