... v = 4,9.106 (m/s) vµ f = 2,82 .110 -12 (N) B v = 9,8.106 (m/s) vµ f = 5,64 .110 -12 (N) A C v = 4,9.106 (m/s) vµ f = 1.88 .110 -12 (N) D v = 9,8.106 (m/s) vµ f = 2,82 .110 -12 (N) -27 (kg), Cõu 42: