WORLD HISTORY

Detailed explanation-1: -Physics, Gravity & the Laws of Motion Sir Isaac Newton developed the three basic laws of motion and the theory of universal gravity, which together laid the foundation for our current understanding of physics and the Universe.

Detailed explanation-2: -It introduced concepts including 4-dimensional spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction.

Detailed explanation-3: -General relativity is physicist Albert Einstein’s understanding of how gravity affects the fabric of space-time. The theory, which Einstein published in 1915, expanded the theory of special relativity that he had published 10 years earlier.

Detailed explanation-4: -An isolated object (i.e. one subject to no forces from other objects) moves at constant velocity, i.e. in a straight line at constant speed. Any constant velocity is as good as any other.

Detailed explanation-5: -Answer and Explanation: (a) Different observers can disagree about the fundamental structure of spacetime. This is not a prediction of the theory of relativity, since the topology of Space-Time depends directly on its causal structure.