A 14.5 kg box is pulled to the right with a force of 40.0 N across a rough surface, which applies a friction force of 11.0 N acting on the box. What is the acceleration of the box?

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.