Question

Total energy of a simple pendulum is E , when the displacement half of the amplitude, its K.E. will be

_______

(A) E

(B) E/2

(C) E/4
(D) 3E/4​

Answer 1

Answer:

D. 3E/4

Explanation:

total energy of a simple pendulum

u=1/2mw2y2

when y=a/4

u`=1/2mw2 (a/4)2=1/2mw2a21/4

u`=E/4

and the kinetic energy = total energy - potential energy

=E-E/4

K=3E/4