How much work is required to lift 20kg object, 2m in the air? Show your work and explain your thinking.
Plz help I’m doing a test

What is the role of the ocular lens?

In what direction does an applied force move an object

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?