Question

projectile motion

Answer 1

A submarine-launched missile has a range of 4330 km.
(a) What launch speed is needed for this range when the launch angle is 45?

(b) What is the total flight time?

(c) What would be the minimum launch speed at a 22 degree launch angle, used to "depress" the trajectory so as to foil a space-based antimissile defense?

Answer 2

\[R=\sqrt{R*g*.001/(\sin(2*45)}\]
this formula can be used to find out range

Answer 3

Do you really mean 4330 km ? The mean radius of the earth is only 6371 km.
Simple projectile physics would not be adequate for that kind of range.
I suspect it should be 4330m, then you can use a very simple formula that relates the maximum range to the launch speed and g.