Physics - Gravitation Question with Solution | TestHub

To remove traffic congestion between two cities such as New Delhi and Moscow, engineers have proposed building a rail tunnel along a chord line connecting the cities. A train, unpropelled by any engine and starting from rest, would fall through the first half of the tunnel and then move up the second half. Assume that Earth is a uniform sphere and ignore air drag and friction. The distance from New Delhi to Moscow via the surface can be taken to be $\frac{\pi R}{3}$, where $R$ is the radius of Earth.