Jawabanmu

2014-02-01T17:28:36+07:00
Ek = 1/2 m v²=1/2 x 2 x 10²=100 joule
Ep = m x g x h=2x10x15=300 joule
Em= Ek + Ep =100 + 300=400 joule
      
2014-02-01T18:34:24+07:00
EK = 1/2 x m x vkuadrat
      = 1/2 x 2 x 10 x 10
      = 1 x 10 x10
      = 100 J
EP = m x g x h
      = 2 x 10 x 15
      = 20 x 10 x 15
      = 300 J
EM = EK + EP
      = 100 J + 300 J
      = 400 J