How much work is done when a girl applies a force of 80 N to move an object 4 m, and then moves the object 1 m back?

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

Asap time is ! best answer gets compose at least one well-developed paragraph on the following: define the term concurrent powers, and give an example of a concurrent power of government.

4. who was the first one to measure the speed of light and conclude that it is finite? 5. who was the first philosopher who thought the speed of light is finite? 13. what is the speed of light numerically? 14. give an example of something moving faster than light 15. give an example for some particles or waves that