Isotopes are two atoms that have the same but different

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

What is created when solids,liquids,an gases mix with one another

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.