Einstein's Statement of The Equivalence Principle
A little reflection will show that the law of the equality of the inertial and gravitational mass is equivalent to the assertion that the acceleration imparted to a body by a gravitational field is independent of the nature of the body. For Newton's equation of motion in a gravitational field, written out in full, it is:
- (Inertial mass) (Acceleration) (Intensity of the gravitational field) (Gravitational mass).
— Albert Einstein,
See momentum and velocity.
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