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Ep=Ek
mgh=mv^2/2
2gh=v^2
v=√2*10m/s^2*20m
v=20m/s
h=20m
Vp = 0
Vk = ?
h = 0.5gt2
2h=gt2
t2= 2h : g
t2 =40m : 10m/s2
t = 2s
Vk = gt
Vk = 10m/s2 x 2s
Vk = 20m/s