A particle $(m=1\mathrm{k}\mathrm{g})$  slides down a frictionless track (AOC) starting from rest of a point $A$  (height $2\mathrm{m}$  ). After reaching $C$ , the particle continues to move freely in air as a projectile. When it leading its highest point $\mathrm{P}$  (height 1 m  ) the kinetic energy of the particle (in J) is: (Figure drawn is schematic and not to scale (take $g=10{\mathrm{m}\mathrm{s}}^{-2}$  ) 

<p><span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">K</mi> <mi mathvariant="normal">E</mi> <mo>=</mo> <msub> <mrow> <mrow> <mi mathvariant="normal">P</mi> <mi mathvariant="normal">E</mi> </mrow> </mrow> <mrow> <mrow> <mn>1</mn> </mrow> </mrow> </msub> <mo>-</mo> <msub> <mrow> <mrow> <mi mathvariant="normal">P</mi> <mi mathvariant="normal">E</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mo>=</mo> <mi>m</mi> <mi>g</mi> <msub> <mrow> <mrow> <mtext> </mtext> <mi mathvariant="normal">h</mi> </mrow> </mrow> <mrow> <mrow> <mn>1</mn> </mrow> </mrow> </msub> <mo>-</mo> <msub> <mrow> <mrow> <mi mathvariant="normal">m</mi> <mi mathvariant="normal">g</mi> <mi mathvariant="normal">h</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> </math> </span></p><p>10</p>

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