Answer:
the man has returned from his trip
Answer: energy transfer. or, kinetic energy.
Explanation:
when something collides with another, it transfers kinetic energy to the other it collided with, making it move.
Answer:
The objects were 1.8m apart.
Explanation:
We will start stating the Coulomb's Law. It says that:

Where F_e is the electric force between the objects, q_1 and q_2 are the magnitude of the charge of the objects, r is the distance between them and K is the Coulomb's constant (
in vacuum). Solving for the distance r we have:

Plugging the given values into this equation, we obtain:

In words, the two charged objects were 1.8m apart.
Answer:
A
Explanation:
all the work is in the attached file :D
We have to convert Gm/s to m/s.
As 
Therefore the speed of light in vacuum,

Thus, the speed of light in m/s is 