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Vi=10m/s
g=9.8m/s^2
h=300m
Vf=?
t=?
Solución
A)....
Vf^2=Vi^2+2gh
Vf=raíz [Vi^2+2gh]
Vf=raíz [(10m/s)^2+2(9.8m/s^2)(300m)]
Vf=raíz [(100m/s)+(19.6m/s^2)(300m)]
Vf=raíz [(100m^2/s^2)+(5880m^2/s^2]
Vf=raíz [5980m^2/s^2]
Vf=77.33m/s
B)....
Vf=Vi+gt
t=(Vf-Vi)/g
t=(77.33m/s-10m/s)/9.8m/s^2
t=(67.33m/s)/9.8m/s^2
t=6.87s
Saludos....