10.A 10 kg rock falls 5 meters and hits the ground. Did the rock have any energy just before it hit the ground? If so, how much? What force did it
require, to get the rock to start moving?

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

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.