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navm1
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Homework Statement
A balloon is attached to a 3m high pole. On the ground is a mortar that fires at a velocity of 7m/s at an angle of 55degrees. How far away does the mortar have to be to hit the balloon?
Homework Equations
y=tan(theta)x-g/(2v0cos2(theta)x2[/B]
The Attempt at a Solution
I rearranged to make a quadratic equation from the equation above and made
g/(2v0cos2(theta)x2 - tan(theta)x+y=0
-9.81m/s2/(2*(7m/s)2(cos2(55deg)x2 - tan(55)x+3m
and ended up with 1.58m and -6.34m
I understand that there will be two solutions because the projectile can hit the balloon on the way up and the way down but i don't think these answers are correct.