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natasha.aries
Group Title
A boulder is launched from the ground by a catapult with a vertical velocity of 13.0 m/s and a horizontal velocity of 15.0 m/s. It misses the enemy castle and hits the ground. How long did it take the boulder to hit enemy ground? (ignore air friction)
A 0.38 s
B 2.65 s
C 0.75 s
D 1.33 s
 one year ago
 one year ago
natasha.aries Group Title
A boulder is launched from the ground by a catapult with a vertical velocity of 13.0 m/s and a horizontal velocity of 15.0 m/s. It misses the enemy castle and hits the ground. How long did it take the boulder to hit enemy ground? (ignore air friction) A 0.38 s B 2.65 s C 0.75 s D 1.33 s
 one year ago
 one year ago

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cesckay Group TitleBest ResponseYou've already chosen the best response.1
step by step.. find the initial speed of the boulder which is just the resultant component of both forces using Pythagoras theorem.
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.1
wait so how would u do that?
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.1
X= sqrt(13^2 + 15^2)
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.1
and then?
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.1
lol.. answer is B.. you dont have to find the resultant component since theres no angle.. sorry :( if you have the vertical component of the velocity, then just use********* time= 2v/g its kind of a long derivation though.. U r supposed to get 2.6503
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.1
where v=13
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.1
how do u know u dont use 15?
 one year ago

cesckay Group TitleBest ResponseYou've already chosen the best response.1
it is not travelling horizontally right? so the components are independent of each other.. ig you were to plug in the value for the horizontal component, then the answer would be wrong.. the resultant velocity will give you a larger answer..
 one year ago

natasha.aries Group TitleBest ResponseYou've already chosen the best response.1
oh okay that makes sense! thanks!
 one year ago
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