Imissed a class and got this assignment yet i do not understand anything. can someone me explain ?

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

12. a body is a particular amount of matter. it can be a solid, liquid or gas. it can be described as existing in a. size and shape. b. motion and force c. time and space. d. location and movement.

The basketball coach tells his team to run sprints back and forth across the court, which is 30 m long. they start at the left end of the court, run back and forth 6 times, then end back at the left end of the court where they began. what distance did they run? what is their displacement?