Jawabanmu

2014-03-12T22:24:25+07:00
2014-03-12T22:29:06+07:00
Diketahui :
h = 20 m
g = 10 m/s2
v = ?
 
jawab :
Em1 = Em2 (ket : Em1 = energi potensial, Em2 = energi mekanik)
m . g . h = 1 / 2 . m . v2 (m sama-sama dicoret)
10 . 20 = 1 / 2 . v2
200 . 2 = v2
400 = v2
v = √400
v = 20 m/s2