Question

The slow down of earth’s rotation due to the loss of mechanical energy of earth moon system is since _______ years from earth’s formation.

(a) 1 billion

(b) 2.5 billion

(c) 3.5 billion

(d) 4.5 billion

Answer 1

The correct choice is (d) 4.5 billion

Explanation: The earth’s rotation is slow down due to the loss of mechanical energy of earth moon system. It is slowed down after 4.5 billion years after its formation.