Jawabanmu

2014-05-25T10:50:18+07:00
M = 40kg
ek = 720 j
v=?

1/2 mv^2 = 720
1/2 x 40 x v^2 = 720
20v^2 = 720
v^2=36
v= 6 m/s
2014-05-25T12:49:07+07:00
Diketahui :
m = 40 kg
ek = 720 joule

ditanya :
V = ?

jawab :
Ek = 1/2 . m . V^2
720 = 1/2 . 40 . V^2
720 = 20 . V^2
720 = 20V^2
V^2 = 720/20
V^2 = 36
V = 6 m/s