Ablock lies on a frictionless floor. a force of 5 n pulls toward the east while a force of 4 n pulls toward the north. what is the magnitude of the net force on the block?

Which object is most likely represented by a dot?

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?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?