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Ek=Ep
mv^2/2=mgh
v^2/2=gh
v^2/2 *1/g=h
h=v^2/2 /g=72/10=7,2
a=v/t
a*t=v
t=v/a=12/10
s=at^2/2
s=10*36/25 /2=360/25 /2=180/25=7,2