Classical Mechanics: Gravitation, SHM

[lifeonfire]

Homework Statement

Let a particle slides in a straight smooth tube passing obliquely through the Earth. Assuming no friction and no rotational effects. Describe the motion. Find Frequency and Period.

Homework Equations

F = -GMm/r^2

The Attempt at a Solution

Don't know how to solve it.

 

[betel]

Did you make a sketch of the problem to visualize what is happening? Can you tell in words what will happen to the particle?