Для кaкого положения механизма угловоe ускорение звeна АВ равна нулю?<img src="/close/store/examRes/%7BF0EDEC6B-BCD6-4D23-BDBD-4DCB7A421638%7D/92%D0%B0.jpg" /><img src="/close/store/examRes/%7BF0EDEC6B-BCD6-4D23-BDBD-4DCB7A421638%7D/92%D0%B3.jpg" /><img src="/close/store/examRes/%7BF0EDEC6B-BCD6-4D23-BDBD-4DCB7A421638%7D/92%D0%B1.jpg" /><img src="/close/store/examRes/%7BF0EDEC6B-BCD6-4D23-BDBD-4DCB7A421638%7D/92%D0%B2.jpg" /> <img src="/img/f7/b182105fb6b80784f66f83512e.jpg" />, <img src="/img/3f/931629afe4293e855cc8b9db94.jpg" />, <img src="/img/83/66e4d0532b5da57d10bff76e74.jpg" />, <img src="/img/10/aafef9570a77d467af8cbadd70.jpg" />