tolong di jawab yaa nomer 14

dik : v = 8 m/s
Ek = 128 Joule
dit : m ?
jawab :
Ek = 1/2 m v²
128 = 1/2 m (8)²
128 = 1/2 m (64)
128 = m (32)
m = 128/32
m = 4 kg