JEE MAIN - Physics (2020 - 7th January Morning Slot - No. 5)
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 )) is :
(Figure drawn is schematic and not to scale; take g = 10 ms-2)_7th_January_Morning_Slot_en_5_1.png)
(Figure drawn is schematic and not to scale; take g = 10 ms-2)
Answer
10
Explanation
KE = PE1 – PE2 = mgh1 – mgh2
= 1 × 10 × 2 – 1 × 10 × 1 = 10 J
= 1 × 10 × 2 – 1 × 10 × 1 = 10 J
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