physics projectile problem....

[lmf22]

A fire hose held near the gound shotts water at a speed of 6.8m/s. At what angle(s) should the nozzle point in order that the water would land 3.0m away?
It asks for 2 different angles.

Any help would be great. Thank you.

[ShawnD]

Make an equation showing the time spent in the air using the distance formula. This is overall vertical distance (0).

d = Vi*t + (1/2)*a*t^2

d is 0, Vi should be 6.8*sin(theta), a is just -9.80. Try to isolate the time. From the looks of it, the time will equal something * sin(theta).

From there, do horizontal distance

d = Vi*t

d is 3, Vi is 6.8*cos(theta), and t is the equation created above. You should end with sin(theta)*cos(theta) = something. From there you can probably just graph it.