https://www.chegg.com/homework-help/questions-and-answers/step-3-create-class-called-customer-implement-simple-class-maintain-information-customer-i-q42199993
https://www.chegg.com/homework-help/questions-and-answers/1-velocity-object-moving-along-axis-given-piecewise-linear-function-v-pictured-figure-611--q29543830