Всегда ли вес равен силе тяжести                                                                                             1всегда                                                                                                                                            2)равен по модулю всегда                                                                                                 3) равен по модулю в случае ускоренного движения опоры                                                   4)равен по модулю в случае покоя или равномерного движения опоры                                                                          
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