Atrunk is dragged 3.0 meters across an attic floor by a force of 2.0n how much positive work is done on the trunk

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?