ly lop 10, giai gium cai
Tu 1 dinh thap nguoi ta buong roi 1 vat. 1s sau o 1 tang thap' thap^' hon 10m nguoi ta buong roi vat thu' 2. hoi 2 vat se~ dung. nhau bao lau sau khi vat thu nhat dc buong roi (lay g=10m/s2)
ly lop 10, giai gium cai
, nhanh nhanh nhaTu 1 dinh thap nguoi ta buong roi 1 vat. 1s sau o 1 tang thap' thap^' hon 10m nguoi ta buong roi vat thu' 2. hoi 2 vat se~ dung. nhau bao lau sau khi vat thu nhat dc buong roi (lay g=10m/s2)