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= 10 кг -- максимально допустимая масса
кг/м³ -- плотность камня
кг/м³ -- плотность воды
. В воде на объект помимо силы тяжести будет действовать и выталкивающая сила Архимеда (направлена вверх, поэтому со знаком минус): 
. Именно поэтому в воде проще поднимать тяжелые предметы. Сила Архмеда определяется следующим образом:
,
- объем тела, а 
- ускорение свободного падения. Объем тела является отношением массы тела 
к плотности тела 
: 
. Таким образом, можем определить вес предмета в воде так:
.
кг.
2м/с
за такие задания нужно больше давать