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 ).

Question

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" /> (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

KE=PE1-PE2=mgh1-mgh2 =1× 10× 2-1× 10× 1=10J

KE=PE1​−PE2​=mgh1​−mgh2​ =1×10×2−1×10×1=10J

$K E = P E_{1} - P E_{2} = m g h_{1} - m g h_{2}$
$= 1 \times 10 \times 2 - 1 \times 10 \times 1 = 10 J$