Answer:
A but not 100% certain.
Explanation:
you can eliminate C since it doesn't mention gravity, and B says gravity is pushing up on the orange. I think it is A because friction is going against the orange because it has to pass through the air, and that creates friction. I think that is the reason why things burn up when they enter the earths atmosphere.
Answer:
A state of rest or balance due to the equal action of opposing forces.
Answer:
Sam's and Abigail speeds before colliding were a. 12.34 m/s and b. 2.86 m/s, respectively. Their total kinetic energy was diminished by c. 1484.42 J, approximately
Explanation:
By conservation of momentum, we have

Writing for each direction at a time,

Their kinetic energy changed by

Answer:
The oldest stars in spiral galaxies are younger than the oldest stars in elliptical galaxies.
Explanation:
Spiral galaxies have a greater star formation than elliptical galaxies, since the latter contain less gas and dust. Therefore, the rate of creation of new stars is lower in elliptical galaxies. These galaxies are dominated by old stars, with a long evolution. While the spiral galaxies have stars with a faster evolution.