A classmate describes a trick he saw using Newton's cradle. He pulled back two of the cradle balls and let them swing down to strike the line of other balls. He then saw three balls swing away on the other side with the same speed as the first two balls. The three balls only rose to 2/3 of the original height. Explain what must be wrong with your classmate's
description.

the answer is b

explanation:

in physics zero. in muscle fatigue could be high

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)