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  4. A point mass of mass 1kg slides down a frictionless track (.AOC.) starting from rest at point A (height 2m ). After reaching C , the particle continues to move freely in air as a projectile. When it's reaching its highest point P(.height1m.), , the kinetic energy of the particle (in J ) is: (Figure drawn is schematic and not to scale; take g=10ms- 2 ). <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-rxjmfkcbyea5rgfz.jpg />

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Q. A point mass of mass $1kg$ slides down a frictionless track $\left(\right.AOC\left.\right)$ starting from rest at point $A$ (height $2m$ ). After reaching $C$ , the particle continues to move freely in air as a projectile. When it's reaching its highest point $P\left(\right.height1m\left.\right),$ , the kinetic energy of the particle (in $J$ ) is: (Figure drawn is schematic and not to scale; take $g=10ms^{- 2}$ ).
Question

NTA AbhyasNTA Abhyas 2022

Solution:

$KE=PE_{1}-PE_{2}=mgh_{1}-mgh_{2}$
$=1\times 10\times 2-1\times 10\times 1=10J$