What killed the Physicist - 1/2mv^2 or mv

rahulpsharma

Joined Sep 5, 2010
60
A Physicist gets hit by a car and dies...

When she reaches the gates of Kingdom of Death, she is greeted by "Chitragupt" (The guy in Hindu Mythology who decides if you would go to Heaven or Hell depending on your Karma)...!!

But Chitragupt makes an exception in this case and says that irrespective of your Karma, I would allow you to go to Heaven if you answer the following correctly:

What killed You...?? Was it
"1/mv^2" that killed You OR was it "mv" that killed You...!!

If the answer is right, she goes to heaven else goes to hell...!! Our physicist needs help to reach heaven...!!

Ofcourse, one difference is a vector scalar thing... But in the sense of causing hurt, what is more likely to cause hurt - KE or Momentum...??

Regards,
Rahul

Papabravo

Joined Feb 24, 2006
20,618
The answer is BOTH since they are not independent. If you know one the other is determined.

Delta Prime

Joined Nov 15, 2019
1,311
Hello there

Fascinating! two diametrically opposed answers. Both are correct.
Neither. Force is not described by 1/2mv^2
or mv.

Papabravo

Joined Feb 24, 2006
20,618
The derivative of one is the other.
So does the derivative kill you or does the integral. I think most students would agree, that the integral is what kills you.

Delta Prime

Joined Nov 15, 2019
1,311
I think most students would agree
Strict equations give way to imagination!
Correction: equations maybe bent without violation. If one uses their imagination. In no way am I saying you have no imagination respectfully Sir.

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jpanhalt

Joined Jan 18, 2008
11,087
It's 1/2mv^2 . Why else is is the American government spending unaccounted billions on kinetic weapons instead of momentum-based weapons. It is not an elastic collision.