¿Cuál es la separación (la distancia) de dos cargas de -4μC y de -4 μC , considera una masa de 1300g y que se mueven con una aceleración de 25ms^2

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.