Ashopping cart accelerates 0.5 m/s2 when a net force of 8 n is applied to it. what is the mass of the shopping cart?

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?