Aboy and girl on ice skates face each other. the girl has a mass of 20 kg and the boy has a mass of 30 kg. the boy pushes the girl backward at a speed of 3.0 m/s as a result of the push the speed of the boy is

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.

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.