If you drop a stone into a hole drilled all the way to the other side of the Earth (neglect the molten core), the stone will

Question

If you drop a stone into a hole drilled all the way to the other side of the Earth (neglect the molten core), the stone will

A) come to an abrupt stop at the center of the Earth.

B) speed up until it gets to the center of the Earth.

C) speed up until it reaches the other side of the Earth.

D) slow down until it reaches the center.

Answer 1

Remember the simple pendulum or spring.

If you let the bob of the simple pendulum from any extreme position, velocity keep increases becomes maximum as it reaches to the mean position. acceleration at this point is zero.

Similarly at the center of earth g = 0, but stone achieve the maximum velocity and keep going to the other end.

Hence in this case, B is correct choice.