T
timlai91
x=4cos(20t-pi/3)
t=o: x=2 ,v=-80sin(-pi/3)>0 suy ra vat chuyen dong ve phia bien duong
vay sau khi di duoc them 2cm thi vat o bien duong,v=0
khong biet noi ngoai 2chu DE SAI
t=o: x=2 ,v=-80sin(-pi/3)>0 suy ra vat chuyen dong ve phia bien duong
vay sau khi di duoc them 2cm thi vat o bien duong,v=0
khong biet noi ngoai 2chu DE SAI