... 3 .23 : )RR(m 2 1 2 2 2 1+. 3 .24 : 2 mR103; 3355rRrRm103. 3 .25 : 2 mR41; 2 mR 2 3. 3 .26 : 2 mR 2 1. 3 .27 : a) )rR(m41 22 +; 2 mR165; b) 22 22 22 rRdmr)rR(m 2 1+ ... 22 22 22 rRdmr)rR(m 2 1+ ; 2 mR 24 13. 3 .28 : 3355rRrRm5 2 . 3 .29 : 2 ma31; )ba(m 12 1 22 +. 3.30: 2 m31. 3.31: a) 2m(a 2 + b 2 ); b) 2mb 2 ; c) 2ma 2 . 3. 32: a) 2ma 2 ; b) ma 2 ; c) 2ma 2 ; d) ... c) s = 0,51m. 1 .25 :15=rad/s 2 ; 24 0 vũng. 1 .26 : 22 m. 1 .27 :b)70,7s c) 25 00m; d) at = 7m/s 2 , an = 7,14m/s 2 , R = 35000m. 1 .29 : 2 2 2 1 22 11vvvvt++=; 2 2 2 1 122 1minvv|vv|d+=....