If mike does 25.5 j of work lifting a book 1.5 m onto a shelf what is the mass of the book in kilograms

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?

Based on this activity, is kinetic energy always transformed into potential energy?