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When an object falls and hits the floor (without bouncing off the floor), the normal force of the floor on the object before, during, and after the collision, A) cannot be determined B) is zero, then increases to a value less than the weight mg of the object, then is equal to mg. C) is equal to the weight of the object D) is zero, then increases to a value greater than the weight mg of the object, then decreases, and eventually is equal in magnitude to mg. E) is zero, then increases to a value greater than the weight of the object, then decreases to zero Can you explain why?
What is the speed of the arrow as it leaves the bow?
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A ball is dropped from rest from the top of a building ofheight 10m. At the same instant, a second ball is projectedvertically upward from ground level, such that it has zero speed when it reaches the top of the building.
What is the magnitude of the negative point charge that must be fixed to the fourth corner, so that the charge at the diagonally opposite corner experiences a net force of zero?
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