Suppose two students grab an end of a rope. Both shake the rope once, but one makes a crest and the other a trough traveling at each other. What would
you see when the crest and trough meet? What type of interference does this show?

Answer(b) 60 miles per hour;

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.

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