In the image below, the black lines indicate that exist molecules and the red dotted lines indicate that exist molecules.

words:

intermolecular forces

intramolecular forces

within

between

1)  intra molecular forces

2) within

3)  inter molecular

4) between

Explanation:

In image below black lines indicate the intra molecular forces that exist within molecules and the red dotted lines indicate the inter molecular forces that exist between the molecules.

1)  intra molecular forces

2) within

3)  inter molecular

4) between

Inter molecular forces:

Inter molecular forces exist between the molecules.

Intramolecular forces:

Intramolecular forces exist between the bonded atoms with in same molecule.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.