Which force is always attractive and has a very small range?

strong nuclear
weak nuclear
gravitational
electromagnetic

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?

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?