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Ep + Ek = Ep' + Ek'
mgh + 1/2 mv ^2 = mgh' + 1/2mv'^2
mgh + 0 = m(gh' + 1/2mv'^2)
gh = gh' + 1/2 v'^2
10 x 25 = (10 x 5) +1/2 v'^2
250 = 50 + 1/2 v'^2
200 = 1/2 v'^2
v'^2 = 400
v' = akar(400) = 20m/s
=akar(2.10.2)
=akar 400
= 20 m/s