What must the total force on an object be for it to travel with a constant velocity? A) 0 N B) 10 N C) 20 N D) 100 N

The basketball coach tells his team to run sprints back and forth across the court, which is 30 m long. they start at the left end of the court, run back and forth 6 times, then end back at the left end of the court where they began. what distance did they run? what is their displacement?