What is a force? 1. An acceleration

2. A push or pull

3.anything that has mass

4.fast velocity

I think 2 i might be wrong

2. A push or pull

Explanation:

I'm 100% sure

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

no. dot product   =0 when vecs at right angles