Jawabanmu

2014-02-02T20:23:28+07:00
EMa = EMb
EPa + EKa = EPb + EKb
mgh +  \frac{1}{2} mv² = mgh +  \frac{1}{2} mv²

gh +  \frac{1}{2} v² = gh +  \frac{1}{2}

250 = 50 +   \frac{1}{2}

200 =  \frac{1}{2}

400 = v²
v = 20 m/s





Dik: h1 = 25 meter ; h2 = 5 meter
Dit: v?
Jwb: v = √2gh = √2 x 10 x (25-5)
v = 20 m/s