A 20.0 kg object is at rest, and then speeds up to 16.0 m/s. How much work was done on this system?

Explain vector addition, triangle method and parallelogram method

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions