A 4000 kg train car moving at 2.4 m/s collides with a second identical train car at rest. If they hook together when they collide, what is the final speed of the two?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation

Amother used 150 watts of power to raise a 15 newton object in a time interval of 8.0 seconds. through what vertical distance was the object raised ?