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## Homework Statement

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° launch angle, used to "depress" the trajectory so as to foil a space-based antimissile defense?

## Homework Equations

Y = 1/2gt

^{2}

And the other projectile motion equations.

## The Attempt at a Solution

Well for part a: i convert the km to meters and find the time it would take for it to make it halfway:

2165000m = 1/2 (9.81m/s

^{2})(t

^{2})

t = 664.4s

Multiply that by 2 and get time of flight = 1328.7s

I get that far and it says it's already wrong because the time of flight is supposed to be 15.7 min. So I don't know what I am doing wrong. Could someone help me out with this problem?

Thanks