# The phase space trajectory of a single particle falling freely from height is? [closed]

The phase space trajectory of a single particle falling freely from height is?

Phase space is a plot between momentum and position, and since kinetic energy increases the momentum must increase with position, so option "2" must be correct, but the answer key shows that answer in option "4". Please tell me the correct method to plot it if my observation is wrong

## closed as off-topic by Emilio Pisanty, JMac, John Rennie, GiorgioP, tpg2114♦May 11 at 7:11

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• That would depend completely on what $z$ is representing. – JMac May 9 at 19:10
• You mean to say, it depends on where we fix our coordinate system – sawan kumawat May 9 at 19:13
• I mean it depends on if $z$ represents current height above the ground, or displacement from the point it was released. – JMac May 9 at 19:15