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  4. A particle ( m =1 kg ) slides down a frictionless track ( AOC ) starting from rest at a point A (height 2 m ). After reaching C. the particle continues to move freely in air as a projectile. When it reaching its highest point P (height 1 m ), the kinetic energy of the particle (in J) is: (Figure drawn is schematic and not to scale; take g =10 ms -2 <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-bu4jcrfkaudw8s97.jpg />

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Q. A particle $( m =1\, kg )$ slides down a frictionless track $( AOC )$ starting from rest at a point $A$ (height $2 \,m$ ). After reaching $C$. the particle continues to move freely in air as a projectile. When it reaching its highest point $P$ (height $1 \,m$ ), the kinetic energy of the particle (in $J$) is: (Figure drawn is schematic and not to scale; take $g =10 \,ms ^{-2}$
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NTA AbhyasNTA Abhyas 2022

Solution:

$KE = PE _{1}- PE _{2}= mgh _{1}- mgh _{2}$
$=1 \times 10 \times 2-1 \times 10 \times 1=10\, J$