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**colinvt11** Hi guys, I am working on some Vector Geometry homework and have come across a problem that I don't know what to do for, any help would be greatly appreciated:

A spring catapult slings a boulder in the air from ground level with an initial speed of 280 feet per second and the boulder crashes back into the ground 7.7 seconds later. At what angle of elevation in degrees was the boulder slung into the air (in degrees)?

I know you would start with a = <0, -32> and v = <280cos(x), 280sin(x)> but I'm not quite sure where the problem goes from there, any help would be greatly appreciated.