A boy flies a kite with the string at a 30 degree angle to the horizontal. The tension in the string is 4.5N . How much work does the string do on the boy if the boy stands still? How much work does the string do on the boy if the boy walks a horizontal distance of 11m away from the kite? How much work does the string do on the boy if the boy walks a horizontal distance of 11m toward the kite?