Jawabanmu

2014-01-18T19:57:23+07:00
Dik = m = 60 kg
         t = 30 detik
         s = 240 m
Ek = 1/2 x m x v^2

v = s/t
v = 240/30
v = 8

Ek = 1/2 x 60 x 8^2
Ek = 1/2 x 60 x 64
Ek = 1920 Joule

ket = tanda ^ = pangkat

maaf kalau salah.. semoga membantu :)
2014-01-18T19:59:01+07:00
Dik : m = 60 kg, w = 30 detik, jarak = 240 m
Dit : ek = .... ?
v = s/t = 240m/30 second = 8m/s
ek = 1/2 x m x v(pangkat dua)
ek = 1/2 x 60kg x 8^2 m/s
ek =1/2 x 60kg x 64m/s
ek = 1920 J(Joule)

Insyaallah betul. :) ^.^