You are watching a race while sitting on a bench. An athlete speeds up from 0 to \(7 \mathrm{~m} / \mathrm{s}\) to the right. Describe his motion from the point of view of another athlete going at

(a) \(5 \mathrm{~m} / \mathrm{s}\) to the right,

(b) \(5 \mathrm{~m} / \mathrm{s}\) to the left, and

(c) accelerating from 0 to \(5 \mathrm{~m} / \mathrm{s}\) to the right.