The amplitude of a simple pendulum is 10cm. When the pendulum is at a displacement of 4cm from the mean position, the ratio of kinetic and potential enegies at that point is,

Options

A. 5.25
B. 2.5
C. 4.5
D. 7.5

Answer

a

Explanation

Amplitude, A=10cm ,Displacement,x=4cm
`(KE)/(PE)=(A^2-X^2)/(X^3)=((10)^2-(4)^2)/(4)^2=84/16=5.25`