posted by Tammy .
a ball thrown horizontally from a point 40m above the ground,strikes the ground after traveling a distance of 9m. with what speed was it thrown? use g=10m/s^2
first i need to find the time so I used y=y_0 +v_0t +1/2at^2
Is this correct?
t= sqrt 8
then proceed to the second part with the right time.