s=at^2*1/2
a=2s/t^2
a=400/20^2=400/400=1m/s^2
a=v/t
v=a*t
v=1*20=20m/s
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s=at^2*1/2
a=2s/t^2
a=400/20^2=400/400=1m/s^2
a=v/t
v=a*t
v=1*20=20m/s