If the total mechanical energy of a particle is 0,is its LM necessarily 0 ? Is it necessarily nonzero ??
I think is shud b necessarily 0.
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1 Answers
106total mechanical energy = 0
i.e. KE + PE = 0
the PE of a body at the surface of the earth taking ∞ as reference = -GMm/R or -mgR
If the KE of the body is such that mv2/2 = mgR then total mechanical energy = 0
But it still has v≠0
So, LM≠0
So, it depends on what is taken as reference for PE and the reference frame also
