A person walks 120 m along +x with speed 12 m s⁻¹, returns 60 m with speed 6 m s⁻¹ and then waits for 10 s. Find the average speed in m s⁻¹.

Question

G1 Physics · Accepted Answer

Forward time = 120/12 = 10 s. Return time = 60/6 = 10 s. Waiting time = 10 s. Total distance = 120+60 = 180 m. Total time = 30 s. Average speed = 180/30 = 6 m s⁻¹.