A runner circles a track of radius 100 m in 100 s moving at a constant rate.If the runner was initially moving north,what has been the runner's average acceleration when halfway around the track?

Question

Quizplus · Accepted Answer

The runner's average acceleration is calculated by the change in velocity over time. Halfway around the track, the runner's direction changes from north to south. The speed remains constant, so the change in velocity is twice the speed directed south. The average acceleration is this change in velocity divided by the time taken (50 s), resulting in 0.25 m/s² directed south.

A Runner Circles a Track of Radius 100 M in 100