The chart show the masses and velocities of two colliding objects that stick together after a collision. According to the law of conservation of momentum, what is the momentum of the object after the collision? 4,500 g · m/s 1,750 g · m/s 1,500 kg · m/s 3,000 kg · m/s

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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.