A bouncy ball is dropped from 12 feet. It bounces up and down, each time returning to a fraction (r) of its prior height. The total vertical distance it travels is 48 feet. What is the value of ?

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.