hi, i imagine the solution to this is rather simple. i don't know the answer to the problem, so i can't be sure if my answer is incorrect or not. i imagine it is. anyone who could offer any insight, i would be most appreciative of.(adsbygoogle = window.adsbygoogle || []).push({});

a .4 kg hockey puck is traveling with a velocity of <20,0>. when it is at <5,3> m it is hit by a hockey stick in the y direction and the stick breaks. sometime later, it is at <13, 21> m. later weights were piled on a hockey stick until it broke. it withstood about 1000 N of force.

how much time (t(contact)) was the stick in contact with the puck?

i determined .018 s

i doubt thats right. i assumed that the x component of the velocity would not change. in that case it took .4 seconds for the puck to reach the new position. if that is correct the new velocity is <20,45> m/s. so dV is <0,45> m/s. .4 kg * <0, 45> m/s = <0,1000> N * dt . since i don't know how to divide vectors (or if i can) i droped the directiong and used magnitude. i then divided giving me the answer. i have a feeling there's something i'm not understanding, but i'm not sure.

i'm kind of disappointed, i want to major in physics but i'm already confused in chapter one! we haven't done any problems in class, so i'm kind of taking a stab in the dark =/

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# Homework Help: Question dealing with momentum?

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