JEE Main Physics question
A particle is released from a height S. At a certain height, its kinetic energy is three times its potential energy. The height and speed of the particle at that instant are respectively
Answer: (D)
Solution
(Same as Q54.) With x the distance fallen, KE=3PE gives x=3S/4; height from ground = S/4, and v = √(2g·3S/4) = √(3gS/2).