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s=200m
u=
v=30m/s
a=2m/s²
t=
Sabemos que:
u²=v²-2as
u=√(30m/s)²-2*2m/s²*200m
u=10m/s
Buscamos el tiempo:
t=(v-u)/a
t=(30m/s-10m/s)/2m/s²
t=10s