Answer:
Force and displacement.
Explanation:
Work done is positive when we push table and it move in the direction of applied force.
I think the answer will be A
Answer:

Explanation:

1+7 = 6+2 =8 -protons
1+15 = 12+4 = 16 - protons +neutrons
1. its must be B and 2. must be C
Answer:
A
Explanation:
Begin as protostars, which fire up when they collapse and become denser and hotter.