james is jumping rope to exercise. everytimr he jumps, he experts 54N of force against the floor .how much force does the floor exerts against james

=force × distance a. work b. velocity c. pressure d. momentum

During which interval are the persons represented by the graph not moving? a) 0 to 0.5 hrs b) 1.5 to 2 hrs c) 2 to 2.5 hrs d) 4.5 to 5 hrs

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?