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Surviving the MCAT

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HELP POOR PHYSICS STUDENT [Mar. 13th, 2008|07:50 pm]
Surviving the MCAT
 mcat_survival[skinnyhunny2]
A human canon has a spring constant of 35000N/m. The spring can be extended up to 4.5 m. How far (horizontally) would a 65kg clown be fired if the cannon is pointed upward at 45 degrees to the horizontal??

I CANT DO IT !!!!!!! HELP!!!!!!!!!! the answer is 1.1X10^3 m

 From: 2008-03-24 08:01 pm (UTC) (Link)
you prolly already have the method devised for this, but you can find the force exerted by the spring using F=kx since the spring is static. Plug in the spring constant and the displacement and solve for F. Using the force, you have the mass of the clow (65kg * 9.8) and you can find acceleration. Using the acceleration you can probably solve using kinematics. The horizontal component (some velocity)cos45 plugged into either X=Xo+(Vo)t+1/2(a)(t^2) or Vf^2=Vi^2+2a(Xf-Xi) (depending on how you solved) should give you the answer you're looking for.