Work Energy And Power Question 329

Question: The particle is released from a height h. At a certain height, its KE is two times its potential energy Height and speed of the particle at that instant are

Options:

A) h3,2gh3

B) h3,gh3

C) 2h3,2gh3

D) h3,2gh

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Total mechanical energy = mgh

As, KEPE=21

KEPE=21 mgh and PE=13mgh

Height from the ground at this instant,

h=h3, and speed of particle at this instant,

v=2g(hh)=2g(2h3)=2gh3



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