The answers are bracketed to the right of each question. I have no problem findi

Question

The answers are bracketed to the right of each question. I have no problem finding part A, but I need help finding part B. Please be very thorough in your explanation of the answer. Thanks!

2) A deuterium nucleus (mass 2.00 u) moving at 650 m/s collides with a helium nucleus (mass 4.00 u)
moving at 480 m/s in the opposite direction. After the collision the deuterium moves at 210 m/s
opposite its initial direction of motion.

(A) What is the velocity of the helium nucleus after the collision? [-50 m/s]
(B) What percentage of the initial total energy is lost in the collision? [94%]

Explanation / Answer

(K2-k1)/K1=(.5*2*210^2+.5*4*50^2-.5*2*650^2-.5*4*480^2)/(.5*2*650^2+.5*4*480^2) =-.9444 so loss=94.4%

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