Why Does Kinetic Energy Change After Collision in EENGA 2019 Question?

[adz7861]

A particle of mass m has kinetic energy E when it collides with a stationary particle of mass M. The two particles coalesce. Which of the following expressions gives the total kinetic energy transferred to other forms of energy in the collision?

I keep getting C as my answer when the correct answer is B.

 

[mfb]

What is answer C, how did you get it, and what is answer B?

I moved the thread to our homework section.

 

[haruspex]

What is answer C, how did you get it, and what is answer B?

I moved the thread to our homework section.

Where it duplicates https://www.physicsforums.com/threads/eenga-2019-momentum-question.995674/.

 

[DrClaude]

Where it duplicates https://www.physicsforums.com/threads/eenga-2019-momentum-question.995674/.

Indeed. This thread is closed. Please post in the one linked above.