A body executes simple harmonic motion under the action of a force $F_1$ with a time period $\frac{4}{5}…
A body executes simple harmonic motion under the action of a force $F_1$ with a time period $\frac{4}{5} \mathrm{~s}$. If the force is changed to $F_2$ it executes SHM with time period $\frac{3}{5} \mathrm{~s}$. If both the forces $F_1$ and $F_2$ act simultaneously in the same direction on the body, its time period in seconds is
$\frac{12}{25}$
$\frac{24}{25}$
$\frac{35}{24}$
$\frac{25}{12}$
Solution
If both force acts simultaneously, then time period $T=t_1 t_2$.
$
=\frac{4}{5} \times \frac{3}{5}=\frac{12}{25} \mathrm{sec}
$