Question

Suppose a tunnel is dug along the diameter of earth. A particle is dropped from a point at a distance $h$ directly above the tunnel. The earth's density is assumed uniform and the friction is neglected, then

• A. the particle will have harmonic oscillations
• B. the particle will have maximum speed when passing through the centre of the earth.
• C. the acceleration of the particle will be maximum just at the point of release
• D. the particle will drop to the centre of earth.centre of earth

Answer 1

Answer: (A)

the particle will have harmonic oscillations

Answer 2

Gravity provides the restoring force