5. Diketahui : m = 1 kg ; h = 2 m v = 2 m/s Berlaku hukum kekekalan energi mekanik = 1 2 = + 2 2 1 1 2 = ℎ + 1 2 1 2 = (1)(10)(2) + (1)(2) 1 2 = 22 1 58 a