For the following questions, imagine the book drops in free fall and falls a distance d. For the system of the book and earth, the change in total energy of the system if the book falls a distance d .(A) is positive.(B) is negative.(C) is zero.(D) has a sign which cannot be determined.

What is a good example of instantaneous speed

Due sun 06/09/2019 11: 59 pm skip navigation questions correct q 1 [1/1] correct q 2 [1/1] correct q 3 [1/1] untried q 4 (0/1) untried q 5 (0/1) untried q 6 (0/1) untried q 7 (0/1) untried q 8 (0/1) untried q 9 (0/1) untried q 10 (0/1) grade: 3/10 print version start of questions two cyclists, 42 miles apart, start riding toward each other at the same time. one cycles 2 times as fast as the other. if they meet 2 hours later, what is the speed (in mi/h) of the faster cyclist?

How can a cyclist's acceleration change even if its velocity remains constant?