A girl throw a rock horizontally with a velocity of 10m/s form abridge. It falls

Question

A girl throw a rock horizontally with a velocity of 10m/s form abridge. It falls 20 metres to the water below how far does the rocktravel horizontally before striking the water.
I did this : V=10m/s d=20 metres
10m/s/9.80=1.020408s
for the distance I did this : (10m/s)(1.020408s)=10m
please let me no if this was done right and let me no where Iwent wrong.....
I did this : V=10m/s d=20 metres
10m/s/9.80=1.020408s
for the distance I did this : (10m/s)(1.020408s)=10m
please let me no if this was done right and let me no where Iwent wrong.....

Explanation / Answer

S=4.9t2 (S= distance drop t= time todrop) 20=4.9t2 sqrt(20/4.9)=2.02=t
Then the next part you did right t*h = x (t= timeh= horizontally speed x=  horizontally distancetraveled) 2.02*10=20.2 meters sqrt(20/4.9)=2.02=t
Then the next part you did right t*h = x (t= timeh= horizontally speed x=  horizontally distancetraveled) 2.02*10=20.2 meters

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