How much work was done on the pulley by the force of friction while the textbook was falling to the floor

When measuring volume, why is it important to use the correct tools and units to attain the greatest accuracy? use specific examples from the lab to support your answer. (5 points)

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?

Newton's second law states that f = m x a (force is mass times acceleration). which example would have the greatest acceleration?