A. Light from other galaxies is shifted toward the red end of the spectrum. B. Cosmic background radiation appears uniform across the sky. C. The amount of helium in the universe matches predictions.
Nucleosynthesis of light elements occurred shortly after the expansion of the original ball of energy.
The universe is expanding.
The universe began from a single point.

1 the 4 is sig

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

at right angles to each other