Question

please answer these questions ​

Answer 1

Answer:

SOOO SOOO SORRY  DONT KNOW THE ANSWER AND I DONT WANT TO COPY THE ANSWER FROM GOOGLE LIKE OTHERS DO.

Explanation:

Answer 2

E.1.Internal forces are the forces acting amongst the particles of the system. For example , in an atom , the intermolecular forces are the internal forces. External forces are the forces acting in the system from the sources that is outside the system.