Chemical equation for the alpha decay of samarium 149

Which feature indicates that mars resides in the inner region of the solar system

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine