Answer:
Charges are transferred from one object to another.
Explanation:
The charges from one object to another are sharing there energy.
Answer:
empty space
Explanation:
Our solar system comprises of the sun as the star, the planets, the dwarf planets, various moons, and plenty of asteroids, comets, and meteoroids. However, the majority part of the solar system consists of a void or empty space. These empty spaces basically composed of planetary dust and gas.
Hence, it can be concluded that Most of our Solar system is composed of "Empty Spaces."
Answer:

Explanation:
velocity of ball in train reference = v2
velocity of ball in earth reference = v1+v2
(a)
Kinetic energy is given by
where m and v are the mass and velocity of object respectively.
Change in kinetic energy is given by subtracting initial kinetic energy from the final kinetic energy. In this case
Initial kinetic energy= 
Final kinetic energy= 
Change in kinetic energy=
(b)
Change in velocity in train reference will be
Initial kinetic energy= 
Final kinetic energy= 
Change in kinetic energy=
(c)
Work done, W = change in kinetic energy=
(d)
Work done, W = change in kinetic energy=