A pumpkin of mass 5kg is shot out of an air cannon at an elevation angle of 45 degrees with an initial velocity of 54m/s. It lands 142 m away. Assuming the force due to air resistance was F=-kmv, find the value of k.(adsbygoogle = window.adsbygoogle || []).push({});

I need some help with this problem. I'm not quite sure how to put in the angle. All i really know is:

F = ma = m(dv/dt) = -kmv ... after integration

ln v = -kt + C1 v(t=0)=Vo C1 = ln Vo

thus:

v = Vo(e^-kt)

i know this is completely off though because no where is there a sin or cos for me to input the angle..

any help would be much appreciated thanks!

ps. i'm a second year student at Michigan State. Astrophysics major.. gone through Calc 4.

tb

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# Homework Help: Kinematics of pumpkin shot out of air cannon

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