Two bodies A and B of mass 1 kg and 2 kg are soldered to two ends of vertical spring of force constant 400 N/m. A being at the upper end and B resting on a table. A is now compressed and then released. The freq. of osillation is :

Options

A. `(10)/(pi)` Hz
B. `10pi` Hz
C. `(pi)/(10)` Hz
D. None of these.

Answer

A

Explanation

Here `n=(1)/(2pi)sqrt((k)/(m))=(1)/(2pi)sqrt((400)/(1))=(20)/(2pi)=(10)/(pi)` Hz.
Correct choice is (a).