The formula for potential elastic energy e of spring is given by equation
e = ½ kx2
where x is the extension of the spring. what are the base unit of k?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.