During a crash test, a truck of mass 1433 kg was driving at 12 m/s when it crashed into a stationary car with mass 862 kg. The truck and car stick together after the collision. How fast is the stuck-together car and truck going after the crash?

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Answerit increases at a steady rate;

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.