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V= 72 km/h
g=10 m/s
h=?
72 km/h= 72× (1000÷3600)= 20 m/s
g= ΔV÷t
t= ΔV÷g
t=20÷10=2s
h= gt²÷2
h=10×2²÷2
h=20 m