?????и?2011???????????????
?????????????? ???????ο???????????
?????????????????У???????????????????????????7?????6???
1.A2.C3.D4.B5.D6.BD7.BC
8.??17???
??1????AD??3??????????????????????????????ò????????????????????????????3?????
??2????2.50N??2???????1.25??3?????0.75??3???????D??3?????
9. ??
??1????С?????????????h, ????t, ??
h = v02/2g ??????????????????????????????????????????????(2??)
??h = 20 m ????????????????????????????????????????????(1??)
??t = v0 / g ????????????????????????????????????????????(2??)
??t = 2 s ????????????????????????????????????????????(1??)
??2????С?????????????С????????????????????????t1????
v??= v??= v 0 ?C gt1 ????????????????????????????????????????(3??)
t1= 1 s
???????????????????????x????С???????????x????
x??= v t1= 10 m ????????????????????????????????????(2??)
x?? = v0 t1 ?C g t12 /2 = 15 m ??????????????????????????????(2??)
????x??+6 m > x??????С??????????? ??????????????(2??)
10????
(1) ??С????B???????С?vB???????????
mg(h+R) = mvB2 /2 ????????????????????(2??)
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